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That does sound like the kind of dumb thing people say (or thing dumb people say - seems equivalent in this case.) But logically the two are completely unconnected. Earth getting greener or browner doesn't say anything about climate change.

Greener -> more carbon sequestered -> better. It's not that simple in reality, but it's about on the level of an average person's knowledge about the topic.

That still doesn't say anything about climate change. It's all about rate of change of carbon dioxide levels in the atmosphere. Greener in terms of forests is a temporary sequestration, greener in terms of farms is a net negative since the carbon is soon returned to the biosphere and we expend a lot of energy in the process. Just to know the earth is getting greener or browner is not enough information to say anything about climate change.

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