Global Warming- Do Humans Have An Impact Or Is It Natural

Some would say that global warming is caused by just humans and their activity by just polluting the world but I am not sure if part of this is natural and not man-ade. Now I am not saying that humans have had no effect on the environment at all we clearly have with all the litter in our oceans but what I am saying is I wonder if global warming can not be stopped. 
If you think about it there was a massive ice cap that covered most of the world around 2.6 million years ago and there was nothing that we could do to stop that. Scientists point out that sea levels have risen and fallen substantially over Earth's 4.6-billion-year history. But the recent rate of global sea-level rise has departed from the average rate of the past two to three thousand years and is rising more rapidly—about one-tenth of an inch a year. A continuation or acceleration of that trend has the potential to cause striking changes in the world's coastlines. This is because all of the pollutants that us humans have caused over the years we have literally trapped sun rays in our atmosphere which is causing the earth to warm up.  With everyone having to stay inside because of the virus that is going around I wonder if this will have an impact on the current pollution that is happening in the world. I mean 3 weeks without humans can not do the earth any harm and potentially heal the earth from previous damage that we have done. 

Let me know your thoughts is it just humans to blame for global warming or is it the earth its self and we can not stop it.