PowerPoint Presentation - Houghton, 2009, p 5.

Climate Changes Resulting from Global Warming

•Glaciers are melting.

•Air temperature ovef land is rising.

•The global percentage of land area in drought has increase by about 10%

•Snow cover is shrinking.

•Regions of Earth where water is frozen for at least one month each year are shrinking with impacts on related ecosystems.
•The southern boundary of North Hemisphere permafrost is retreating poleward.

•Tree lines are shifting poleward and to higher elevations.

•Spring is coming earlier.

•Plants are leafing out and blooming earlier each year.

•The lower atmosphere (troposphere) is warming.

•The tropics gave expanded.

•Species are migrating poleward and to higher elevations.

•Atmospheric humidity is rising.

•The global water cycle has accelerated.

•Air temperature over the oceans is rising.

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