Edit: Ah, read this comment as by peri_renna - thanks!
Look, I can't pretend to know enough about climatology to have my own opinion, here - that's why I cited experts in the first place. Further, I wouldn't expect human activity to be the only important influence on the environment. However, what I've heard suggests that continued deforestation and greenhouse gas emissions would likely effect major climate changes (if they haven't already) and that major climate changes would likely devastate human civilization. That deforestation and greenhouse gas emissions significantly affect the weather is obvious - you can see it on the weather radar loops near cities. The degree to which they affect the climate is more difficult to show, but the expert consensus seems to be that it's significant. The degree to which the weather affects human civilization is obvious - just look at what happens when a drought strikes. The degree to which climate change could affect human civilization is, again, harder to determine, and again, the expert consensus is that it's significant.
If the above don't constitute facts, then I'm sorry. If the totality of these facts don't lead you to a particular conclusion, I'm sorrier still. There is rational ground for concern here, and it bothers me when the incompleteness of our knowledge is used to belittle that concern.
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Look, I can't pretend to know enough about climatology to have my own opinion, here - that's why I cited experts in the first place. Further, I wouldn't expect human activity to be the only important influence on the environment. However, what I've heard suggests that continued deforestation and greenhouse gas emissions would likely effect major climate changes (if they haven't already) and that major climate changes would likely devastate human civilization. That deforestation and greenhouse gas emissions significantly affect the weather is obvious - you can see it on the weather radar loops near cities. The degree to which they affect the climate is more difficult to show, but the expert consensus seems to be that it's significant. The degree to which the weather affects human civilization is obvious - just look at what happens when a drought strikes. The degree to which climate change could affect human civilization is, again, harder to determine, and again, the expert consensus is that it's significant.
If the above don't constitute facts, then I'm sorry. If the totality of these facts don't lead you to a particular conclusion, I'm sorrier still. There is rational ground for concern here, and it bothers me when the incompleteness of our knowledge is used to belittle that concern.