Six reasons why Earth won't cope for long

The world faces a dangerous convergence of environmental and resource crises, not all directly climate related. All, however, are increasingly difficult to resolve in a rapidly warming world. Taken together, they are not amenable to a business-as-usual political response. Here, in no particular order, are six:

…4. Peak oil: This month, the International Energy Agency formally predicted global peak oil by 2020. Today, the world burns the equivalent of 82 million barrels of oil every day. Projected growth in energy demand will see this rise to almost 100 million barrels within a decade, but by then, output from the oilfields currently in production will have plummeted to barely a third of that. A massive energy gap is looming, and with discoveries having peaked in the mid-1960s, we are approaching the bottom of the cheap oil barrel. Non-conventional oil, renewables and nuclear will be nowhere near capable of bridging this energy gap in time. The oil shocks of the coming decade will be intense.

5. Peak food: the global food system is predicated on lashings of cheap oil, fresh water, soil and natural gas. All four are in decline. The food riots of 2008 were an early warning of a global system in crisis. In the US, it is estimated every calorie of food energy requires 10 calories of fossil fuel energy. More food production is now being channelled into fattening animals. Meat is a tasty but entirely inefficient way to use finite food resources. Meanwhile, the UN predicts the collapse of all global commercial marine fisheries by 2048, depriving up to two billion people of food.

6. Peak water: During the 20th century, human water usage increased nine-fold, with irrigation (for agriculture) alone using two-thirds of this total. With almost all major glaciers retreating, many river systems are at risk. Groundwater in aquifers is another key fresh water source. Over-extraction, mostly for agriculture, has caused their levels worldwide to plummet. Pollution, especially from fertiliser overuse, adds to the loss of fresh water. The Environmental Protection Agency yesterday reported only 17 per cent of Ireland