“Christine Largarde, the head of the International Monetary Fund, has warned that the world risks a triple crisis of declining incomes, environmental damage and social unrest unless countries adopt a more sustainable approach to economic growth.

Ahead of the Rio+20 Earth summit later this month, she said the rich should restrain their demands for higher incomes while there are still 200 million people worldwide looking for a job and poverty is on the rise.

Giving her clearest backing yet to green taxes and a range of measures to protect the environment, she argued for taxes on petrol-guzzling cars among a range of green measures to tackle climate change.”

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