Global warming is a result of human activity, it's not "just another cycle", we are definitely making it worse, not catastrophically fast (at least for our generation), but the threat is absolutely real
And it happens not just because of cars and oil burned, all the waste from the factories, all the buildings happening, everything we burn, everything we dig into the earth to get rid of and have our comfort untouched makes it worse, a tiny bit worse, but there's 7 billion of us and the number grows
I won't ramble about rainforest and desert expansion, all you need to see to feel the impact - pacific garbage patch