Global warming, on the other hand, is a separate process that can be caused by increased amounts of greenhouse gases in the atmosphere. ... Warm air from Earth's surface rises and cold air above it rushes in to replace it. When warm air reaches the tropopause, it cannot go higher as the air above it (in the stratosphere) is warmer and lighter preventing much air convection beyond the tropopause. ... The stratosphere is warmer at the top than the bottom. ... Warm air is less dense than cool air, because the air molecules are farther apart. ...

• Word Count: 3528
• Approx Pages: 14
• Grade Level: High School

Despite the daze about what is causing extreme weather, it is clear that the planet is warming up and we are seeing severe weather all around the world. ... The problem with global warming and climate change is although everyone agrees it is happening there is debate over how and why. Not all areas of the world are warming at the same rate and some areas of the world have not warmed at all in recent decades. ... As it descends, it warms up causing any water vapor in the air to evaporate. This prevents clouds from forming meaning that all the Sun's energy reaches the Earth's surface, ...

• Word Count: 4336
• Approx Pages: 17
• Has Bibliography