Climate Central reports: The world’s oceans could face a massive reshuffling by the end of the century – the likes of which hasn’t been seen in as many as 3 million years – due to warming waters.

Changes are already afoot in the oceans. Roughly 93 percent of the heat trapped by human greenhouse gas emissions is ending up in the world’s seas and already contributing to changes from slowing plankton growth to recent incursions of tuna near Alaska, thousands of miles from their normal range.

If greenhouse gas emissions continue to build, that heat could create wholesale changes for the vast majority of the world’s oceans (which, of course, make up the vast majority of the world).

The findings come from a new study published in Nature Climate Change, which looks at future climate projections and the distant past when 60-foot sharks prowled the oceans, sea levels were 100 feet higher and the globe was about 11°F hotter. Oh, and humans weren’t around, either. [Continue reading…]