Climate Change Stratosphere made up of gases that trap radiation (heat) from earth’s surface, causing it to be warmer than otherwise Acts like greenhouse,

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Presentation transcript:

Climate Change Stratosphere made up of gases that trap radiation (heat) from earth’s surface, causing it to be warmer than otherwise Acts like greenhouse, sunlight let in but not all radiation let out Natural effect that is vital to human life Without greenhouse effect, earth’s average temperature would be roughly -18 o C (-0.4 o F); instead of its current +15 o C (59 o F)

Carbon Dioxide is the most important gas in stratosphere generating greenhouse effect CO 2 in the atmosphere has grown by 20% over the last 250 years In the last 30 years alone it has grown 8%.

Greenhouse gases Scientists link increase in greenhouse gases to human activity Many human activities (such as exhaling) involve emission of greenhouse gases Increase in greenhouse gases linked mainly to economic activity involving burning of fossil fuels

Examples of CO 2 emissions and burning of fossil fuels – Gasoline in cars – Coal in electric plants

Increasing greenhouse gases are related to an estimated warming of the earth of 0.3 degrees (celsius) per decade. This is much greater than estimated rate of change during previous periods of warming and cooling 0.05 degrees celsius

Effects Climate Change Large uncertainty regarding effects Effects anticipated to differ greatly across regions, countries In general richer countries expected to be less affected then poorer Wealthier countries are in cooler climate areas, and have more resources to use to adapt

Effects Climate Change (Damage) 1.Sea levels expected to rise due to melting ice in polar regions Coastal regions forced to adapt 2.Changes in agriculture; rising temperature may change location of crops Many poor countries largely dependent on agriculture Effects expected to be negative but actual changes are unknown 3.Changes in ocean current

Cost of Climate Change Extremely difficult to put dollar value on damage from marginal ton of CO 2 emitted Effect of CO 2 takes on a time dimension – Effect of warming caused by emissions will be felt mainly by future generations – Future generations may arrive at solutions that will have made present actions less necessary

A country’s total CO 2 production = Population × GDP/Pop × Energy/GDP × CO 2 /Energy GDP/Pop: Wealthier countries tend to produce more greenhouse gases – Consume more goods and services whose production/consumption generates CO 2 Energy/GDP Countries that produce/use energy as large proportion of GDP produce more greenhouse gases – People may commute great distances; or use a lot of resources to stay warm or cool

CO 2 /Energy Countries that rely on certain energy technology will produce more CO 2 – Reliance on coal for energy produces CO 2 ; reliance on nuclear produces less CO Emissions by country

Climate Change Equity and economic efficiency of proposed policies on CO2 emissions Each country decrease emissions by equal proportion Countries should adjust so that emissions per capita would be equalized Countries should adjust such that emissions per dollar of GDP is equalized (each would be equally energy efficient)

Kyoto Protocol 1997 agreement provides targets for developed countries to reduce greenhouse emissions Ratified and came into force in 2005 Under agreement many developing countries would not have to limit emissions

Kyoto Protocol Agreement set targets that were to be met over the years 2008 to 2012 In 2012, an amendment to Kyoto was adopted (Doha Amendment) that set greenhouse gas targets through 2020Doha Amendment So far only 25 countries have agreed to abide by Doha US did not sign onto Kyoto protocol or its amendment