I heard on the radio this morning that the warming climate will make conditions "increasingly ideal" for disease-carrying insects to establish themselves in the UK. I was wondering whether you can have even more ideal than ideal, then I remembered that we often say "less than ideal", which I think is OK. If the top of the mountain equals "the ideal" for the climber, you can come down from it but (unless you can fly) you can't go higher than it. I think the newsreader might have been better off saying "increasingly suitable" or something like that.