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Arctic scientists are reporting today that a four-square-kilometer chunk of the Ward Hunt Ice Shelf has broken off.

Northern explorers have used the Ward Hunt Ice Shelf as a launching point for expeditions for years. But much like the changes that I have witnessed in my expeditions to the Antarctic, things just aren't right at the other Pole either.

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Heidi Cullen, climate expert and correspondent for The Weather Channel and formerly a scientist at the National Center for Atmospheric Research in Boulder, Colorado explains why scientists are so sure that our burning of oil, coal, natural gas and other fossil fuels is causing a disruption in the earth's climate systems.

The video is part of recently launched climate change science communications project called Climate Central.

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Although they couldn’t agree on the method, 160 chief executives of leading U.S. companies have agreed that climate change is a serious issue and requires a comprehensive worldwide solution.

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Every third European is affected by allergies and some experts say global warming may be the culprit in part because pollen-spreading trees are now in bloom longer.