As spring approaches in the Northern Hemisphere, warmer weather, sunnier skies and often still-significant snowfall continue to draw skiers and boarders to the slopes.

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During summer the Northern Hemisphere is tilted towards the Sun so we get longer days and warmer weather.

BBC: Why the Moon is getting further away from Earth

It is clearly getting warmer in the northern hemisphere.

BBC: Ice records reveal warming trend

They are cooler than the "Medieval Warm Period" about 1, 000 years ago when Eric the Red and his Icelandic Viking tribe settled on grasslands of Greenland's southwestern coast, and much warmer than about 400 years ago when the Northern Hemisphere plunged into depths of a "Little Ice Age" (not a true Ice Age).

FORBES: Would a global warming really be that bad?