True, but don't forget that large scale events also would occur without human intervention. It cant be denied that our actions are the cause for a lot of changes, but a volcano or an earthquake are just natural occurences. We live on a big ball of mud.
A significant element of the present era is that several distinct existential risks humans face are either self-imposed or self-inflicted.
Climate change, overpopulation, mass extinction, resource exhaustion, the threats of nuclear war and winter, self-imposed mass epidemic (particularly biowarfare), long-term chronic pollution (especially lead, mercury, and dioxins), ozone layer, mutagens, genetic drift.
Others aren't directly imposed but are self-inflicted: systemic global supply-chain collapse risk, global financial system collapse risk, creating potential breeding grounds and vectors for global pandemics, etc.
The risk of exogenous events -- supervolcanos, asteroid impacts, solar storms, nearby supernovae -- aren't affected by human activities. But in the case of endogenous events, we're directly affecting the probabilities.
