An example of endothermic reactions is evaporation of water. Water evaporation is a physical change. In a physical change, no bonds are broken and no new bonds are formed. The molecules of the water go from being close together to being far away from each other and moving rapidly. In order for the liquid molecules to separate from each other and move more rapidly, they need to be given energy to break away from each other. This process absorbs energy which makes it endothermic process.
This affects the world a lot. If there was no water evaporation we would be flooded. The oceans would have such a high sea level that the cities would get flooded. Water vapor helps form clouds so if water didn't evaporate then there would not be any clouds. If there are not any clouds then there could be no rain. So the world would just be a big flooded, non-percipating place. 
http://www.kentchemistry.com/links/Matter/EndoExo.htm
http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa_pre_2011/chemreac/energychangesrev1.shtml
http://education.nationalgeographic.com/education/encyclopedia/evaporation/?ar_a=1
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