Sir Jonathon Porritt is a leading environmentalist and writer with over 40 years in this field. He is one of the cofounders of 'Forum for the Future' working very closely with businesses and governments around the world to solve complex sustainability challenges.
- Written by Bru Pearce Bru Pearce
- Published: 21 July 2015 21 July 2015
There is a lot of talk about loss of biodiversity but very little is said about the loss of total biomass. A huge amount of evidence exists to show that the overall biomass on land has been massively reduced over the past 3,000 years and increasingly evidence is coming to light in respect of the loss of biomass in the oceans. Loss of biomass on land may well be as great as 50%, loss of biomass in the seas could be as high as 80%. If this is correct one of the consequences of man’s actions over the past 3,000 years is that the overall annual living carbon cycle has been massively reduced by perhaps as much as 70% of what it would have been over the preceding four million years.