There’s no hard and fast year or time when action needs to be taken, because there are so many variables involved. If we kept going business as usual for a few more decades, and then completely stopped carbon emissions, we might be okay. This won’t happen, of course, but it’s plausible that we won’t take truly significant action for a decade and then really change fast. On the other hand, if we change at a slower rate right now we would also be fine. It’s a question of how fast we cut emissions. Scientists have established 350 parts per million of CO2 in the atmosphere as the upper safe limit, so whichever way we can avoid getting to that point will work.
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