"My view is that climate changes have happened in the last 80 years, that is, the world has got a little bit warmer, although not as warm as it has been in Medieval times, or the Bronze Age"

Piers Corbyn is recommending that the climate has actually changed in the last 80 years, with the globe ending up being a little warmer. Nonetheless, he is also suggesting that the present environment is not as cozy as it was during the Medieval times or the Bronze Age. This suggests that the current environment is still cooler than it was in the past, which the recent warming fad is not as severe as it has remained in the past. This might be taken a caution that the existing warming fad could end up being more extreme if it proceeds, and that we ought to take steps to reduce the effects of climate adjustment. Corbyn's sight is that we need to be aware of the possibility for more extreme climate change in the future, and also take steps to lower our effect on the environment.