Dude, signs that earth is warming are recorded all around the world. Conspiracy theorists love to disregard science, you have plenty of them, denying moon landings or saying that the earth is flat, you cannot convince these people of anything.
The reality is that the average temperature has risen over the last century. Now there is some debate on whether is our fault or not.
''The top authority for assessing scientific research on climate change has concluded that global warming is "unequivocal,"
that humans are "extremely likely" to be the dominant cause''
Now obviously, scientists do not have enough data about this, no one was measuring the earth's temperature thousands of years ago and it's also not entirely clear what is causing it, if it's indeed our fault. However to say that it is a hoax and basically think that somehow all these scientists are working together to lie to us about it is quite stupid.
Thankfully our god, Elon Musk will take us to mars and we won't need to worry about it