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by 2030, if nothing changes, mankind would need two planets to sustain its lifestyle

Sir David King, the British government's former chief scientific adviser, said: "We all need to agree that there's a crisis of understanding, that we're removing the planet's biodiverse resources at a rate which is as fast if not faster than the world's last great extinction."

50 countries are already experiencing "moderate to severe water stress on a year-round basis"

27 countries are "importing" more than half the water they consume - in the form of water used to produce goods from wheat to cotton - including the UK, Switzerland, Austria, Norway and the Netherlands.

A person's footprint ranges vastly across the globe, from eight or more "global hectares" (20 acres or more) for the biggest consumers in the United Arab Emirates, the US, Kuwait and Denmark, to half a hectare in the Democratic Republic of Congo, Haiti, Afghanistan and Malawi.

The global average consumption was 2.7 hectares a person, compared with a notional sustainable capacity of 2.1 hectares.

Today the Highlands of Scotland are one of the most deforested lands in the world. Perhaps equally disturbing, the Scots of today, according to Hand, have virtually no conception of a forest, of its ecological vastness and beauty.

environmental problems can be understood as equally serious across generations even while the problems worsen.

half of the country's power is driven by water

The study calculates that the Mau Forest's value to the electricity sector is $131.6m.

This blaze of lurid colour helps to make tourism one of Kenya's biggest earners, and the study reckons this industry receives $65 million in benefits from the forest.

Further services provided by the forest include an estimated $89million in storing carbon, $98million in controlling soil erosion and $21million in support for fisheries.