12B. ClimateChange

Arctic sea ice minima september arctic sea ice minima

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: s of Asia's biggest rivers could disappear by 2035 as temperatures rise. In India alone, Ganges provides water for drinking and farming for more than 500 million people. Arctic sea ice minima September Arctic sea ice minima 2010: 4.6 2011: 4.3 2012: 3.4 In 2007, there was a record low September Arctic sea ice cover" Greenland 1992 2002 Small glacier from Stauning Alps, east Greenland Ice edge in 2005 Ice edge ~1900 Jakobshavn Ice Stream in Greenland Discharge from many major Greenland ice streams has accelerated markedly Source: Prof. Konrad Steffen, Univ. of Colorado Greenland A NASA study of Greenland’s ice sheet reveals that it is rapidly thinning Frozen area around Greenland is thinning, in some places, at a rate of more than three feet per year Any loss of ice could result in higher sea levels Why care about ice sheets? No agreed-upon worst case; maybe 3-4x this rise? Don’t believe this could happen faster than centuries, but we might in decades reach the level that would commit us to this over centuries. Generally NOT in cost/benefit projections. Potential Effects of Global Climate Change Change in Biosphere Shifts in range of plants and animals with variety of consequences Alpine and subalpine plants and animals with more restricted areas Sea ice melting causing stress in Arctic and Antarctic species Warming of shallow ocean waters causing stress on tropical species including coral reefs Melting Glaciers Summers are lasting longer at the north pole Polar Bears in jeopardy; can’t hunt on thin ice www.youtube.com/watch?v=Ef1VMw6XRt4 Potential Effects of Global Climate Change Warning Signs Today: The current pace of sea-level rise is 3.1 mm/y vs. 1.7 mm/yr in 20th century and 0-0.6 mm/yr back to Roman times; itappears to be accelerating Global sea level has already risen 4-8 inches in the past century - scientists' best estimate is that sea level will rise by an additional 19 inches by 2100, and perhaps by as much as 37 inches The Rise and Fall of Sea Level Lecture 13B deals with sea-level rise and its impacts View of NY harbor from the JOIDES Resolution in an ice-free world (73 m rise) CO2 Emissions in the U.S. Large amounts of CO2 produced generating electricity (e.g. coal fired power plants) What can you do to reduce CO2 emission? 1) drive fuel efficient vehicles 2) use public transportation 3) use energy efficient appliances Reducing the Impact Reduction of greenhouse gases/ change in reliance...
View Full Document

Ask a homework question - tutors are online