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Questions and Answers

What is climate change?

Climate change is the alteration of weather patterns in a place over a long time.

What does "weather" refer to?

Weather refers to the atmospheric conditions, including temperature, humidity, precipitation, wind pressure, the appearance of typhoons, etc., in a place for a particular time.

What does the word "climate" refer to?

Climate is the average weather of a place over a long time, let's say 30 years or more. Average weather or climate means the averages of precipitation, temperature, humidity, wind velocity, etc. Hence, the climate of a place is predictable.

What kind of data is used to determine climate change?

<p>Climate data can be categorized as modern climate data and paleoclimate data. Modern climate data are collected directly using modern technology, while paleoclimate data provide information about past climates, obtained from various sources like ice cores, soil, and trees.</p> Signup and view all the answers

Modern climate data are collected by satellites from space.

<p>True</p> Signup and view all the answers

Paleoclimate data only includes climate information from the past thousands of years.

<p>False</p> Signup and view all the answers

What are some examples of sources for paleoclimate data?

<p>Loess</p> Signup and view all the answers

What are ice sheets, and how many are there on Earth?

<p>Ice sheets, also known as continental glaciers, are masses of glacial ice that occupy an area over 50,000 km². Currently, there are only 2 ice sheets that remain on Earth, the Antarctic ice sheets in the south pole and the Greenland Ice sheets in the north pole.</p> Signup and view all the answers

What methods are used to detect changes in ice sheet mass?

<p>Since 2002, climate scientists have employed remote sensing methods using orbiting satellites (GRACE and GRACE Follow-On Satellites) to detect changes in the mass of these ice sheets.</p> Signup and view all the answers

What does the term "mass balance" refer to?

<p>Mass balance is the difference between the mass gained by the ice sheet due to snow deposition and the mass loss by melting and calving.</p> Signup and view all the answers

A negative mass balance indicates that melting and calving rates are occurring faster than snow deposition.

<p>True</p> Signup and view all the answers

Regarding the ice sheets in Antarctica and Greenland, what trend has been observed?

<p>From the data collected between 2002 and 2016, and from 2018 up to the present, climate scientists found out that the ice sheets in Antarctica and Greenland have increasing negative mass balance.</p> Signup and view all the answers

What is the rate of change in the ice sheet mass of Antarctica?

<p>The ice sheets in Antarctica are changing at the rate of 148 billion metric tons/year.</p> Signup and view all the answers

What is the rate of change in the ice sheet mass of Greenland?

<p>Greenland ice sheets are melting faster than the Antarctic ice sheets, with the rate of 279 billion metric tons/year.</p> Signup and view all the answers

The minimum coverage of Arctic sea ice has been increasing over time.

<p>False</p> Signup and view all the answers

What is the rate of decline for Arctic sea ice minimum?

<p>Arctic sea ice minimum is in a continuous decline, at the rate of 13.1% per decade.</p> Signup and view all the answers

Why is the shrinking of Arctic sea ice a concern for polar bears?

<p>One of the most affected by the decreasing Arctic sea ice cover is the Polar Bears. These carnivores rely on the sea ice to hunt sea lions. This polar bear in the photo may have not eaten for months due to the decline of its hunting ground.</p> Signup and view all the answers

What is the main reason for the need for paleoclimate data to be extended back to thousands or millions of years?

<p>It takes 30 years to establish the baseline climate information of a place, and another hundreds or perhaps thousands years to detect climate change. Thus, to prove that climate change is happening, climate data must be extended back to several thousands or millions of years. This would allow for analyzing trends over longer time periods that can indicate meaningful change trends.</p> Signup and view all the answers

What techniques are used to gather information about the climate thousands of years ago?

<p>Climate scientists have employed various techniques to gather information on the climate of the planet thousands of years ago. These efforts allowed climate scientists to extend the climate records of the Earth thousands of years backwards.</p> Signup and view all the answers

What is loess?

<p>Loess is a special type of soil that is produced primarily by the weight and movement glaciers.</p> Signup and view all the answers

How do glaciers contribute to the formation of loess?

<p>Glaciers are thick and heavy packs of ice sitting on top of a landmass. When glaciers sit on top of huge rocks, their weight and movement can grind those rocks into powder, resulting in a special type of soil called the loess. The rocks on which the glaciers once sat become deformed as well.</p> Signup and view all the answers

Loess soils provide evidence that ice sheets once extended beyond Greenland.

<p>True</p> Signup and view all the answers

What is an ice core?

<p>Ice cores are cylinders of ice drilled from ice sheets and glaciers.</p> Signup and view all the answers

How is the age of an ice core determined?

<p>The age of the ice sheet can be determined from the annual layers of the ice cores. Summer snow layer in the polar regions has light coloration due to its 24-hour exposure to the sun. In contrast, winter snow appears dark. Since it takes a year to have summer and winter, a snow layer with light-to-dark bands therefore represents a year.</p> Signup and view all the answers

What is the significance of ice core chemistry?

<p>The chemistry of the ice cores can also tell the past temperatures of the ice sheets. The oxygen atom in water can either be the heavy (O18) or the light (O16) isotope. Also, one or both atoms of hydrogen in water can be the Deuterium (H2) isotope.</p> Signup and view all the answers

The accumulation of heavy oxygen (O18) and Deuterium isotopes in the polar regions correlates with low temperatures.

<p>False</p> Signup and view all the answers

What significant discovery has been made through the analysis of ice core chemistry?

<p>Ice core chemistry analysis revealed that the Earth has been to 8 ice ages in the past 800,000 years.</p> Signup and view all the answers

What is the IPCC, and what is its role?

<p>The Intergovernmental Panel on Climate Change (IPCC) is the United Nations body for assessing the science related to climate change.</p> Signup and view all the answers

The IPCC's assessment report has concluded that human activities are the primary cause of the 21st century climate change.

<p>True</p> Signup and view all the answers

What is the greenhouse effect, and how does it contribute to climate change?

<p>Greenhouse effect is a well-evidenced theory that explains climate change. According to this theory, the earth's atmosphere is &quot;blanketed&quot; by greenhouses, like CO2, CH4, and nitrous oxides. The heat-absorbing nature of these gases keeps the earth's temperature at magnitudes that allow life to thrive. Without it, there could be no life on earth.</p> Signup and view all the answers

What is the main reason for the dramatic increase in atmospheric CO2 levels since the Industrial Revolution?

<p>The dramatic increase in atmospheric CO2 levels is attributed to the increased emission of CO2 from the use of fossil fuels starting in the industrial revolution.</p> Signup and view all the answers

What is the major cause of the increasing trend in global surface temperature?

<p>Plotting Co2 levels and global surface temperature yields an almost perfect fit-CO2 levels seem to influence global surface temperature. As shown in the graph above, as Co2 levels continue to rise (solid gray line), global surface temperature also rises (red/blue bars).</p> Signup and view all the answers

What is the primary focus of current UN-initiated interventions to address climate change?

<p>Interventions to climate change are focused on resiliency programs and the reduction of CO2 emissions.</p> Signup and view all the answers

What is the significance of the Kyoto Protocol?

<p>The Kyoto Protocol is an international agreement that legally binds countries which are heavily industrialized and have economies in transition to limit their greenhouse gas emissions.</p> Signup and view all the answers

What is the main objective of the Paris Climate Agreement?

<p>In 2015 during a meeting in Paris, world leaders had a landmark agreement that was aimed to combat climate change and to accelerate and intensify the actions and investments needed for a sustainable low carbon future.</p> Signup and view all the answers

What is the role of the Philippine Climate Change Commission?

<p>In 2009, Republic Act 9729 (Climate Change Act of 2009) signed was into law, which led to the creation of the Philippine Climate Change Commission (CCC). CCC serves as sole policy-making body of the government which shall coordinate, monitor and evaluate the programs and action plans of the government relating to climate change.</p> Signup and view all the answers

What is the Green Climate Fund?

<p>The Climate Change Commission manages the Green Climate Fund from the United Nations, a funding that aims to assist the Philippines for its climate change adaptation and mitigation projects.</p> Signup and view all the answers

What is the People's Survival Fund, and what is its aim?

<p>The CCC also manages the People's Survival Fund (PSF), amounting to Php 1 Billion per year, which is intended for projects that are aimed for increasing community resilience on climate change.</p> Signup and view all the answers

Study Notes

Climate Change and Society

  • Climate change is the alteration of weather patterns in a place over a long time.
  • Weather refers to atmospheric conditions, including temperature, humidity, precipitation, wind pressure, and the appearance of weather events like typhoons, at a particular time.
  • Climate is the average weather of a place over a long time (e.g., 30 years or more). Averages of precipitation, temperature, humidity, and wind velocity help predict climate.
  • The changing climate of the Earth is supported by scientific evidence.
  • Modern climate data is collected using technology such as satellites.
  • Paleoclimate data comes from sources like ice cores, soil, and trees, providing information about past climates spanning thousands or millions of years.
  • A climate scientist gathers and analyzes data from the atmosphere, oceans, and land; creates computer models to simulate climate change; studies past climates to understand potential future changes.
  • A climate scientist needs a BS or graduate degree in Atmospheric Science or a related field like Physics, Chemistry, Geology, or Engineering; strong mathematical and computing modeling skills; technical writing ability.
  • The IPCC is the United Nations body responsible for assessing the science related to climate change.
  • In 2013, the IPCC's 5th assessment report stated 95% certainty that human activities cause 21st-century climate change.
  • The greenhouse effect is a well-established theory explaining climate change; the atmosphere traps heat-absorbing gases (like CO2, CH4, and nitrous oxides) keeping Earth's temperature suitable for life.
  • Historical CO2 levels, measured from ice cores, show that current concentrations are higher than any point in the past 800,000 years, coinciding with the industrial revolution and the increased use of fossil fuels.
  • Ice sheets and glaciers are losing mass (indicated by negative mass balance) worldwide, contributing to rising sea levels.
  • Data from remote sensing satellites like GRACE and GRACE Follow-On shows this loss in detail.
  • Loess, a specific soil type, forms from the grinding of rocks by moving glaciers, providing evidence of past ice sheet extent.
  • Ice cores from ice sheets provide information about Earth's past climate changes extending thousands or millions of years.
  • Ice cores hold information on past temperatures by measuring oxygen and hydrogen isotopes in water, as well as annual snowfall patterns.
  • The combination of modern and paleoclimate data shows Earth's climate system is warming.

Lecture Outcomes

  • Students should be able to describe climate change.
  • Students should be able to discuss modern and paleoclimate data supporting climate change reality.
  • Students should be able to interpret the IPCC's assessment of 21st-century climate change as anthropogenic.
  • Students should be able to identify worldwide and national initiatives to mitigate climate change.

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