Sponges tell us that the warming started in the 1860s
Sponges tell us that the warming started in the 1860s

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Caribbean sea sponges suggest world may already have breached key 1.5C climate threshold

It’s not surprising that we may have passed 1.5c however the confirmation that climate science is on the money is a worry.
Here is an article from an issue of Popular Mechanics decrying the consequences of carbon pollution. So we've known about this for about as long as it's been happening as well.