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Global Warming
Global warming is the average rise in the earth's temperature. Global warming is caused by the greenhouse gases (including carbon dioxide, methane, water vapour, etc...) and these gases trap the sun's heat inside our earth's atmosphere. Global warming has both positive and negative impacts on us; for example, hot weather could attract tourists to cold countries like the UK and this develops the economy. However the heat can also attract mosquitoes and cause life threatening diseases such as malaria.

However Climate change has an impact on the environment as the weather becomes extreme causing droughts, famines, floods (due to ice caps melting which leads to sea level rise). This affects people as well because it can cause many deaths, destroy properties, and cause massive destruction to all, including animals because diversity is decreasing. For example, polar bears and many other species are becoming extinct...

Carbon pollution is the main reason our planet is getting hotter, increasing the chances of weather disasters, drought and flood and hurting our health. There are solutions. For starters, we can cut carbon pollution by reducing our dependence on fossil fuels and increasing our use of clean, renewable energy. And we can implement policies that help us prepare for flooding, drought, storms and other consequences of climate change.

Climate change will have a significant impact on the sustainability of water supplies in the coming decades. A new analysis, performed by consulting firm Tetra Tech for the Natural Resources Defense Council (NRDC), examined the effects of global warming on water supply and demand in the contiguous United States. The study found that more than 1,100 counties -- one-third of all counties in the lower 48 -- will face higher risks of water shortages by mid-century as the result of global warming. More than 400 of these counties will face extremely high risks of water shortages.

http://www.nrdc.org/globalwarming/watersustainability/images/overview.png

http://fabiusmaximus.files.wordpress.com/2012/07/global-warming-31.jpg