The temperature of Earth has been a result of it's own evolution and other celestial influences. Vegetation being one the most primitive life-forms was a product of a conducive environment -- a combination of moderate temperature, humidity/ water, sunlight and soil.
There are many factors, which determine climatic conditions and in turn influence vegetation. Location with regards to proximity to the equatorial region, sea levels or high altitudes, make a great impact on the kind of vegetation found. Extreme conditions are unviable for sustaining vegetative forms of life. Icy cold temperatures can freeze such life forms while extreme heat can burn them, e.g. Palms cannot survive in arctic weather but they are well nourished in the warm humid weather and tropical sandy soil.
There are many factors, which determine climatic conditions and in turn influence vegetation. Location with regards to proximity to the equatorial region, sea levels or high altitudes, make a great impact on the kind of vegetation found. Extreme conditions are unviable for sustaining vegetative forms of life. Icy cold temperatures can freeze such life forms while extreme heat can burn them, e.g. Palms cannot survive in arctic weather but they are well nourished in the warm humid weather and tropical sandy soil.