@ruffler45
The planet's climate cycles dramatically: true. It has been both much hotter and much colder. These cycles take hundreds of thousands of years; even the shockingly fast ones took thousands to complete.
We're still coming out of the last ice age: true. This is why many of the global temperature charts we see go back 11,000 years - that's when the ice cover had retreated enough to allow the warmed surface to melt more ice, so the overall temperature started climbing faster.
Global warming would be happening naturally, then: true.
Humans can't stop the planet warming: partially true. We now have enough data, and clear enough climate science, to show that our CO2 and CH4 emissions are causing much faster warming. Tellingly, the temperature gradient becomes steeper as fossil-fuelled industrial activity increases. This is still ongoing.
It doesn't matter anyway: false unless you don't give a shit about the future of your own species. On a global scale, humans have a very small tolerance window. If we want to give future generations time to figure out how to thrive on a changing Earth, we need to stop heating the climate.
My tiny carbon footprint won't make much difference: mostly true. The main culprit is industrial activity. Countries like China, India and others are entering a peak Industrial Age, burning fossil fuels, polluting waters and disturbing seismology at the rate Europe saw 150 years ago. And they are bigger.
It's not worth trying: false. Eight billion people, each producing a bit more carbon waste, add up to a significant impact. Every little helps.
The UK's being crap: false. Like other European nations, we have massively reduced our carbon impact and continue to improve. The USA's doing a heck of a lot worse.
There's no real hope: FALSE! After reading a very cheering series of articles in the Economist, I made this post about the near future with 'clean' energy. Have a look 😎https://www.mumsnet.com/talk/am_i_being_unreasonable/5115812-to-tell-you-gen-z-and-alpha-will-live-in-a-prosperous-world-of-new-ideas