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There seems little doubt that the world climate has been warming starting about 1960; evidence is strong about that. A problem, though, is that warming has hesitated for the last 10 years, a feature that doesn't seem compatible with the increase in CO2 proposed as the cause of warming because CO2 has kept increasing during that time period. Couple that with the scandal of missing data used in making models of climate change, that disclosed by the stolen emails of attempts to keep skeptics from publishing in peer-reviewed journals, and the shortness (about 50 years or less) of the warming interval suggests that the case for human-caused warming is not a strong as many have proposed.
I think an unbiased observer would have to conclude that it's plausible that people cause significant climate change but scientific proof at this time is lacking. (this was not one of the alternatives in the options)
As others point out, the fear of climate change strengthens research of alternatives to fossil fuels that are rapidly being consumed; this research is absolutely essential.
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