How much energy could be produced by tidal power in the UK?
 
The Tidal power resources of the United Kingdom could produce about 50 TWh a year of which the Severn barrage   would  produce 17 TWh each year enough for 450,000 people and one on the Solway 10 TWh enough for 250,000 people.
 By comparison  a nuclear power station (Torness) produces  about 12 TWh,  the same amount of energy that would be produced by a 1200 wind turbines. Enough energy for 320,000 people.

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Algae to grow biofuel

Texas based PetroSun is producing 30 tonnes of diesel plus 110 tonnes of other biomass per hectare per year at a photosynthetic efficiency of 4.7% which is probably 10 times more efficient than diesel produced from grain crops.

Uptake of Carbon Dioxide by the Oceans

It has been estimated that since 1800 118 billion tonnes of carbon released into the atmosphere have been taken up by the oceans. This amounts to one third of the carbon dioxide produced by mankind during this time. The most important organisms removing carbon dioxide are the coccolithophores. These organisms were very active in the past when  the chalk and limestone deposits were produced some 55 million years ago (Palaeocene-Eocene Termal Maximum) .