9 ways we know humans caused climate change
https://www.edf.org/climate/9-ways-we-know-humans-triggered-climate-change
By Ilissa Ocko, Climate Scientist
Most Americans recognize climate change, but some are still unsure about its causes. Tens of thousands of scientists in more than a hundred nations have amassed an overwhelming amount of evidence pointing to a clear conclusion: Humans are the main cause of climate change.
We’re the ones who burn fossil fuels, produce livestock and clear trees, increasing the amount of heat-trapping gases in the atmosphere.
It’s like the smoking-cancer link
No one questions the link between smoking and cancer, because the science was settled in the 1960s after more than 50 years of research.
We can think of the state of human activities and climate change as no different than smoking and cancer.
In fact, we are as confident that humans cause climate change as we are that smoking causes cancer.
Scientists have no doubt that humans are causing global warming.
So what’s the evidence?
The research falls into nine independently studied, but physically related, lines of evidence: