"I don't think we can have confidence that anything else can do this," the Berlin-based chief executive told a London climate change conference.
These methods will be faster to scale then complicated and industrial intensive carbon capture at coal and natural gas plants and factories and creating massive national and global pipelines to move the captured gas into underground storage.
Expand Commercial Kelp Growth by 100 times
There is a proposal to use about 9% of the oceans surface for massive kelp farms. The Ocean surface area is about 36 billion hectares. This would offset all CO2 production and provide 0.5 kg of fish and sea vegetables per person per day for 10 billion people as an "incidental" by-product. Nine per cent of the world's oceans would be equivalent to about four and a half times the area of Australia.
In 2016, seaweed farms produce more than 25 million metric tonnes annually. The global value of the crop, US$6.4 billion (2014), exceeds that of the world's lemons and limes.