Commenting following today’s release of monthly climate statistics by WWF Scotland, which show that 2007 is predicted to be the warmest year ever globally, Harvie said that while the SNP government has agreed to introduce early climate legislation setting targets to reduce pollution every year, the legislation may not be fully in place until 2009.

He said: "Legislation is important, and we look forward to it obliging Scottish government to put in place actions to reduce pollution every year, but we must start this year.

“That means there are major question marks over projects that will increase carbon emissions such as the Aberdeen Bypass, the M74 Extension and the expansion of airports. And it means that stalled projects that would tackle congestion and reduce traffic levels such as the Aberdeen and Glasgow Crossrail schemes need to be dusted off and looked at again."

The WWF report also shows that Spring 2007 was the second warmest ever recorded in Scotland. Scotland has already seen one month more than three degrees above the average, two months more than two degrees warmer than average and one month more than one degree warmer than average.

Dr Richard Dixon, director, WWF Scotland, said: "Scotland escaped the major flooding which hit the north of England  but it was still a very wet June here. Yet again people felt it was cool but the temperatures were actually still nearly a degree above the long-term averages, with 2007 still on course to be one of the warmest years on record.

"June also brought the promise of a Climate Change Bill from Scotland's new government. While the proposed target of an 80 per cent reduction in greenhouse gases by 2050 is very welcome, we need action now, even before the Bill is written to make sure we don't lose momentum in addressing our contribution to climate change."

To find out more about WWF Scotland's monthly climate report go here.