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1) Either the warming is significant such that it presents a danger to humans, whether directly or indirectly, or it is not. I don't think there is any doubt that the relatively small amount of warming trends we have seen is already alarming and has cost lives and money. We can only expect more problems if things get worse.
2) It is either a product of something natural, or it is a product of human interactions, or it is product of a combination of the two. The fact is that we can't continuously dump toxins into the air, pollute the environment, consume every resource unsustainably and reproduce uncontrollably and expect to not have an impact on the environment. Specifically, the trends in CO2 and methane release into the air is unparalleled and is a dangerous experiment on our existence and the health of the planet. In all likelihood, the trends are linked to human activity, but even if it wasn't the case, we are reached the precipice where we need to start making some hard decisions if we want to sustain our existence.
3) It is either something that we can control, or we can't. We most definitely can influence our own effects on this planet, but it may not be possible to save ourselves from every natural disaster or terraform the planet against the natural processes at play. We can do nothing and allow our species to die or hope things don't get that bad, or we can be proactive. We can defend ourselves from ourselves, and maybe in that effort, we learn to defend ourselves from a natural armageddon.
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