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give the description of the enviromental problem: Climate changes
Climate change is the biggest and most controversial environmental issue of our times. [ Or rather, the cause of climate change is. The fact that the Earth's climate has changed over its history - sometimes with cataclysmic consequences, called mass extinctions, for many of the planet's inhabitants - is not disputed. However, what has been the cause of fierce debate is whether or not human activity is currently causing a warming of the world. What climate change, man-made or not, is not - is short term weather. These trends are much bigger and much longer term than a hot summer or a cold
winter, we're thinking more of ice ages than cold snaps when we talk about climate change. There are a number of reasons why the Earth's climate has changed historically. As the continents have moved through the process of plate tectonics they see changes in their climate, both as a result of the influence of the changing oceans and the size of landmass. The Sun also plays a role: as the main source of heat and light for the planet, its activity is a major player in our climate and it is not a constant; fluctuating both cyclically and as it goes through its lifespan as a star. The Earth's position relative to the sun is also not as constant as you might like to think, we're not in a circular orbit and the tilt of the planet also changes, causing changes in how all that heat and light from the Sun hits the planet's surface. Volcanic activity too can change climate by putting large amounts of material into the Earth's atmosphere and thus reflecting heat away from the surface. ]
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Expert answered|selymi|Points 8182|
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Asked 5/1/2012 10:19:48 AM
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