Forecasters speak in probabilities. One of the arguments for saving biodiversity is that in this dwindling array of life forms are answers to questions we currently do not know how to ask. When I was learning my genetics lessons back in the 60s we learned that genes, meaning DNA, makes messenger RNA, makes protein for one function. Well, it now seems most protein products have more than one function. In 30 short years, technology, theory expansion, and new methods have combined to provide insights on the nature of life from the molecular level upward.
Ignorance still rules.
With the proper will, we might be able to do something about climate change. More prudent use of antibiotics, for example greatly reducing their use in raising livestock, could greatly mitigate the novel and resurgent infections. I am not going to worry about the meteoric impacts on the surface of the earth. Well, I don't think we want to muck around with it very much. It has served us pretty well from the trees to an upright stance on the African savanna and even through these past 10,000 years of the agricultural experiment.