In ecology, there's a term called negative feedback of ecosystems. It's the relationship between different species, causing an equilibrium using the distribution of energy of the sun to the various lifeforms, and is propagated by biodiversity. This translates roughly to the bigger the range of biodiversity, the better an ecosystem can withstand extreme changes and maintain equilibrium. Some species receive the brunt of the attack and go extinct, but others survive because there are natural mechanisms in place.
Ecologically and therefore scientifically speaking, humanity is a threat to the environment by forcing itself unto natural habitats and lowering biodiversity. To put it in a simple example, we are removing forests, which is a type of ecosystem with extreme biodiversity, and replacing it with man-made habitats with a fraction of the aforementioned biodiversity. Whenever an extreme phenomenon occurs, there will be no absorption of the hit. For example, there will be not enough microorganisms or earthworms to take care of removing soil toxicity by organic matter, and the soil becomes infertile, causing erosion and a chain reaction of catastrophic events.
Man is therefore indirectly responsible for ecological catastrophes, but can prevent them.
There are sea worms in the polar region north of Norway. They eat the bacteria trapped in methane-rich ice, that in turn eat the methane trapped in the ice. If the population growth of those worms goes wild, it is theorised that the worms will start digging deep into Norway's continental shelf and due to their size and number, are able to eat at the methane rich foundation, causing a collapse, propagated by the release of methane. That can lead to a total collapse of the foundation and cause a tsunami thousands of meters high that will destroy pretty much the entire world.
This is just one example of preventable catastrophes that man can control, there are myriad others.