" I think it is arrogant to believe human beings can destroy all life on earth"
I think you haven't thought about the outcome of a nuclear war. One human (without access to the nuclear button) can't do much to change the climate, but 7B humans and our cars and power plants and herds of cattle can do a quite a lot.However, we won't destroy all life. Critters living around thermal vents in the ocean should survive.
Half the world's species failing to cope with global warming as Earth races towards its sixth mass extinction
C) Do Humans have the capacity to correct it?"
Correct it? Not without geoengineering, ( hacking the planet), and/or industrial grade carbon sequestration. We might be able to hold the increase to 2.5 degrees.
Re-Engineering the Earth
As the threat of global warming grows more urgent, a few scientists are considering radical—and possibly extremely dangerous—schemes for reengineering the climate by brute force. Their ideas are technologically plausible and quite cheap. So cheap, in fact, that a rich and committed environmentalist could act on them tomorrow. And that’s the scariest part.
theatlantic.com
Is it Human caused?
Study: humans have caused all the global warming since 1950*
Global warming attribution studies consistently find humans are responsible for all global warming over the past six decades.
The percentage contribution to global warming over the past 50-65 years in two categories: human causes (left) and natural causes (right), from various peer-reviewed studies. The studies are Tett et al. 2000 (T00, dark blue), Meehl et al. 2004 (M04, red), Stone et al. 2007 (S07, green), Lean and Rind 2008 (LR08, purple), Huber and Knutti 2011 (HK11, light blue), Gillett et al. 2012 (G12, orange), Wigley and Santer 2012 (WG12, dark green), Jones et al. 2013 (J13, pink), IPCC AR5 (IPCC, light green), and Ribes et al. 2016 (R16, light purple). The numbers are best estimates from each study. Illustration: Dana Nuccitelli
theguardian.com
* Consistent with the last IPCC assessment report, we find that most of the observed warming over this period (+0.65 K) is attributable to anthropogenic forcings (+0.67 ±± 0.12 K, 90 % confidence range), with a very limited contribution from natural forcings ( -0.01±0.02-0.01±0.02 K).
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