As mentioned in a previous post, activities on the Sun affect the Earth's climate, not only that but the Earth's orbit around the sun is actually more like an ellipse rather than a perfect circle. This is because other planets (notably Jupiter and Saturn), comets and asteroids pull on the Earth with their own gravity. This means that there are periods where the Earth gets closer or further away from the sun. This too has an effect on climate. We hear a lot of negative effects about climate change such as rising sea levels, loss of polar ice caps etc. However, there are more positive effects as shown here.
Rising sea levels means more liquid water to evaporate and fall back down again as rain. Also more carbon dioxide in the atmosphere means more food for plants. This means higher crop yields. I remember watching a natural history DVD which said that plants can lose 90% of its water through the sames pores in the leaves which it breathes the carbon dioxide. More carbon dioxide means less pores need to be open and then less water will be lost. All this unfortunately is lost in the climate change debate.
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