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Water shortages could affect 5bn people by 2050, UN report warns

Conflict and civilisational threats likely unless action is taken to reduce the stress on rivers, lakes, aquifers, wetlands and reservoirs

More than 5 billion people could suffer water shortages by 2050 due to climate change, increased demand and polluted supplies, according to a UN report on the state of the world’s water.

The comprehensive annual study warns of conflict and civilisational threats unless actions are taken to reduce the stress on rivers, lakes, aquifers, wetlands and reservoirs.

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Is the way we think about overpopulation racist? | Fred Pearce

Half the world lives in urban areas, yet environmental concerns about megacities often focus on developing economies. But consumption is as important as population

It is just 50 years since the publication of Paul Ehrlich’s book The Population Bomb galvanised the global discussion on overpopulation. Published in 1968, his million-selling Malthusian polemic suggested that over-breeding poor countries were killing the planet. And it began in a megacity: India’s capital, Delhi.

Related: The 100 million city: is 21st century urbanisation out of control?

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London air pollution activists 'prepared to go to prison' to force action

Group of campaigners arrested after spray painting mayor’s offices as part of a series of direct action protests over of the capital’s illegal air pollution

Air pollution protesters say they are prepared to go to prison as they step up their campaign against the poisonous air that kills tens of thousands of people in the UK each year.

A group of campaigners including pensioners and young parents, were arrested on Monday after targeting the offices of London mayor Sadiq Khan, spraying slogans on the walls calling for tougher action on air pollution.

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Climate change soon to cause mass movement, World Bank warns

140m people in three regions expected to migrate before 2050 unless environment is improved

Climate change will result in a massive movement of people inside countries and across borders, creating “hotspots” where tens of millions pour into already crowded slums, according to the World Bank.

More than 140 million people in just three regions of the developing world are likely to migrate within their native countries between now and 2050, the first report on the subject has found.

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Ban new petrol and diesel cars in 2030, not 2040, says thinktank

Green Alliance says ending UK sales earlier would close climate target gap and halve oil imports

Ministers have been urged to bring forward their 2040 ban on new diesel and petrol car sales by a decade, a move which an environmental thinktank said would almost halve oil imports and largely close the gap in the UK’s climate targets.

The Green Alliance said a more ambitious deadline of 2030 is also needed to avoid the UK squandering its leadership on electric cars.

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