There is no consensus yet on the most fearful things. The most fearful things are used as levers to promote political change, but there is no consensus on the solutions to our problems. That consensus may grow, so we should keep an open mind.
I do believe man has a strong influence, but I think things like over fishing and pollution are far more immediate problems, and solutions to those problems should be vigorously pursued.
I think we should make our planet a more livable place. I just don't think the benefits of the solutions proposed by climate alarmists will be worth the public costs...but I do know that those solutions will line the pockets of donors and lobbyists.
Warming has been the single best thing to happen to humanity in the past 18,000 years. There is no consensus that that will change, but there are strongly political hypotheses on that. In reality, the next ice age (if we don't succeed in keeping the world warm enough), will be far more dangerous to humanity than getting a bit warmer. Getting warmer may not be great (we can talk about that), but we are about to get colder if the temperature records are accurate, and that would be far worse than what the climate alarmists are predicting for global warming.
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Regarding space not being heated: There is clear consensus on that. Space can't be heated because space is just empty volume. Think about the Thermos bottles people use to keep coffee warm. Thermos bottles work because there is a vacuum between most of the inside and the outside. Heat cannot cross by conduction from the coffee to the outside because there is a vacuum inbetween...there is nothing to conduct the heat...the heat has to gradually escape via conduction through the parts of the lid where there is no vaccum, from atom to atom, molecule to molecule.
(Note: Radiation is a different issue...that is how the Sun warms the Earth...actually, the Earth warms itself by catching and absorbing the Sun's radiation. If the Earth isn't there to absorb, then the radiation continues through space and nothing is warmed.)