I don't know if it's reasonable or not, it's a complicated science. But I have confidence that if it's considered true by mainstream climate science then I won't question it and I will tend to agree.
You've been assigned the job of producing the evidence that climate scientists are together on it.
Fwiw, until you produce real evidence, a 1 further 1 degree rise in the temperature of the earth could produce runaway climate change that could cook us all.
You see, it's more complicated than denialist's kneejerk conclusions.