Yes - there is absolutely no doubt whatsoever we (as in us humans) have significantly altered our climate, 99+% of the scientists are not wrong
They predicted it and it is happening, their only mistake seems to have been how fast it would happen, they thought about a century to get to +1.5°C and we are already there 20 years from their warnings
They also predicted that beyond 1.5 degrees there would be a danger of 'tipping points' and when they happen it will be unstoppable and changes more rapid.
even without tipping points, it is on the way, humans are too greedy for the 'here and now' to ever reverse anything
We probably need to concentrate on living with it rather than wasting our time trying to stop it