For most athletes, the recommended time during the yearly training cycle to begin restriction of energy intake to lose large amounts of stored body fat is:

For most athletes, the period in their yearly training cycle during which it is recommended to begin calorie restriction so as to lose significant amounts of stored body fat is the off-season or early in the preseason. Restriction of energy intake late in the preseason when there is rigorous training or during season when there is competition may impede training, recovery, or performance.

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explanation:

plate tectonics and volcanic euptions

over time, plate tectonic processes cause continents to move to different positions on the globe.

for example, britain was near to the equator 300 million years ago, and therefore was hotter than it is today. for further details look at our climate through time poster or online map.

the movement of the plates also causes volcanoes and mountains to form and these too can contribute to a change in climate.

mountain ranges formed by plate tectonics. large mountain chains can influence the circulation of air around the globe, and consequently influence the climate.   warm air might be deflected somewhere cooler by the mountains.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: