United Kingdom, Dec. 4 -- King Charles doesn't want his grandchildren to "accuse" him of failing to help save the planet.

The 78-year-old monarch - who has sons Princes William and Harry with late ex-wife Princess Diana - is a staunch environmentalist and he admitted his work on the dangers of climate change is driven by not wanting to leave the younger generations with a "ghastly legacy of horror".

Speaking on documentary Steve Backshall's Royal Arctic Challenge, which looks back at the royal's trip to the Canadian Arctic in 1975, he said:

"These things are rescuable, but it seems very peculiar to me that in other areas everybody takes what the scientists are saying as absolute vital truth, but in this case for some reason or other it...