Ananova:

Gordon Brown is calling for a renewed global consensus on tackling climate change.

In his first major speech on the environment, the Chancellor will insist failure to combat global warming will put economic growth at risk.

Speaking to the United Nations in New York, he will insist there is no conflict between environmental policies and economic success.

The speech comes after Mr Brown questioned Tory leader David Cameron's environmentalism.

The Chancellor said Mr Cameron - who is visiting Norway to see the effects of climate change - had to move beyond words and draw up substantive policies to tackle global warming.

He said that meant taking difficult decisions and showing leadership.

He will tell the UN: "Failure to act on the environment will put at risk future economic activity and growth.

"Far from being at odds with each other, our economic and environmental ambitions reinforce each other.

"Environmental sustainability is not an option, it is a necessity. For economies to flourish, for global poverty to be banished, for the wellbeing of the world's people to be enhanced - we have a compelling and ever more urgent duty of stewardship to take care of the natural environment and resources on which our economic activity and social fabric depends. So the new synthesis we need is that economic growth, social justice and environmental care advance best when they all advance together."

Mr Brown will also use his speech to press the World Bank to bring forward proposals for a new 20 billion-dollar (£11.5bn) programme to fund cleaner energy for emerging economies.