Global warming may have reached 2 degrees by the end of the decade — much faster than expected according to an Australian-led team of researchers.
Their findings come from an unusual source, a rare sea sponge that is hundreds of years old, a type of sea sponge found in the Caribbean Sea.
This species, which has a lifespan of about 300 to 400 years, changes the chemical composition of its skeleton with changes in temperature.
Because they live so long -- they grow in layers, continuously all the time -- we actually have a continuous record of change all the time. And for that matter, we're back to the 1700s.
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