This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: Two 20 th century warming episodes Separated by a ~20 year period with no trend Warming since~ 1970 is most pronounced #2: why is it getting warmer? Is it natural? Yes relationship between getting warmer in ocean and land Is it anthropogenic? Is it both? Yes its both. Natural and human signal The anthropogenic signal likely comes from an increase in greenhouse gases (GHGs) E.g., CO 2 , CH 4 , NO x #3: what is likely to happen? Global circulation models predict climate changes over next 50-100 years Based on likely #4 what if anything should be done Global efforts to curb GHG emissions Rio (1992)- U.N. Convention on Climate Change Kyoto (1997)- Kyoto Protocol -- not a success Copenhagen (2009) Copenhagen Accord -- weak...
View Full Document
- Spring '07