Scientists have found evidence from ocean sponges that suggests the Earth has been warming for a longer period of time than previously thought. However, some scientists are skeptical of this evidence.
Several ancient sponges, dating back centuries and found deep in the Caribbean, have prompted some researchers to consider the possibility that human-induced climate change began earlier and has had a greater impact on global warming than previously believed. They calculate that the world has already gone past the internationally approved target of limiting global warming
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