climate change

Change of climate that is attributed directly or indirectly to human activity, altering the composition of the global atmosphere and which is in addition to natural climate variability observed over comparable time periods.


clams [photo]

Figure 22: This series of photographs show tiny young clams dissolving in acidified water. CO2 is absorbed from the air by ocean water, acidifying the water and thus reducing the ability of juvenile clams to grow their shells. As seen in the photos, where CO2 levels rise progressively from left to right, 36-day-old clams (measured in microns) grown under elevated CO2 levels are smaller than those grown under lower CO2 levels. [fn][[nid:1088]][/fn]

earth's atmosphere figure [cite]

a. By Surachit CC BY-SA 3.0, via Wikimedia Commons b. By NASA Earth Observatory [Public domain], via Wikimedia Commons