We will never know for sure because in many ways nature does what nature does. However, it does seem as if nature is being affected by what humans are doing with transportation and technology. So it seems as if we need to take a look and claim responsibility for some of the disasters that are befalling earth.
Carbon in the atmosphere is at its highest levels in the past 650,000 years and it's not due to volcanic ash. Humans with their internal combustion engines, coal-fired electric plants and industrial processes are poisoning the atmosphere and making it hotter. The extra heat warms the oceans and causes more evaporation into the air which causes more weather and more extreme weather.