USA Climate Change
Discussion about Climate Change in USA. How has global Climate Change affected USA?
Are there many Environmentalist in USA actively protesting abuse of the Environment, USA Global Warming, etc.? What is the influence of USA Climate Change on the country? Who are the most known USA Environmentalist?
Half of all Americans - 148 million - live with unhealthy levels of air pollution:
The report, found smog, or ozone, had worsened in 22 of the 25 biggest US metropolitan areas, including Los Angeles, Houston, Washington-Baltimore, New York City and Chicago - and said there was a high risk of more high-ozone days because of climate change. Ref. Source 1
400,000 Turn Out For People's Climate March In New York City:
The rally comes at an opportune time as 120 world leaders, including President Barack Obama, are expected to convene Tuesday at the United Nations in New York to discuss ways to tackle the growing threat of carbon pollution Ref. Source 9
US national forests and grasslands could yield less water in future climate
A warmer climate may lead to higher growth and productivity on US national forests and grasslands, but researchers say this could reduce quantities of freshwater flowing from most of these lands, even with increases in precipitation. Ref. Source 2i.
Model predicts how forests will respond to climate change
Using a new model, researchers predict that many forests across the US are ill-suited to withstand drought conditions likely to face the country in the coming century. Furthermore, in the Pacific Northwest, and across much of the US southern border, conditions may well require the development of new forest types not currently seen in the US. Ref. Source 9s.
How towers helped determine the impact of the 2012 U.S. Drought on the carbon cycle
In 2012, the United States experienced the warmest spring on record followed by the most severe drought since the Dust Bowl. A team of scientists used a network of Ameriflux sites to map the carbon flux across the United States during the drought. Ref. Source 9i.
Warming could slow upslope migration of trees
Scientists expect trees will advance upslope as global temperatures increase, shifting the tree line—the mountain zone where trees become smaller and eventually stop growing—to higher elevations. Subalpine forests will follow their climate up the mountain, in other words. But new research suggests this may not hold true for two subalpine tree species of western North America. Ref. Source 8a.