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[–] usernameistaken ago 

While the temperature change might look small, the overall effect can be quite significant between temperature changes. Given the size of the earth and the amount of energy it takes to heat or cool, a 0.9C is a significant amount.

Think of it this way. To boil a litre of water to 100C it takes 20mins of heat. to take the water to 100.9C in the same amount of time, you need to add more heat. Now imagine heating the water on earth to that extra 0.9C, which will take a lot of heating since time remains the same. So, even though you are only seeing a 0.9C change, the amount of heat earth is being subjected to pretty massive. which in turn results in lakes drying up, rainfall shortage, fires etc...

Here is an article i found from NASA that may be helpful.