LONDON/MOSCOW - The British government is deeply disappointed that US President George Bush has not made a greater commitment to tackling climate change before the G8 summit, its Environment Secretary has disclosed.

In a rare, outspoken critique of the US position on global warming, Margaret Beckett told The Independent of the Government's frustration at the lack of "common ground" with Washington on the need for action on the environment.

The US has consistently blocked attempts by Britain to put progress on tackling climate change alongside G8's moves to scrap African debt at the Gleneagles meeting of the leading industrialised nations next month.

Mrs Beckett added that signing the Kyoto protocol was clearly "off the agenda" for President Bush, who was "coming from a different place in the dialogue" on the issue of global warming.

She said the Government had made no secret that it wants the White House to be "more engaged" on climate change. "Certainly there is a degree of disappointment that there isn't more common ground than there already is," she said.

Her remarks come days after Mr Blair returned from talks with President Bush about global warming in Washington.

At Westminster, Mrs Beckett's criticism will be interpreted as a sign of growing frustration with the White House over an issue that the Prime Minister wants to see given top billing at the summit in Gleneagles.

Mrs Beckett said that President Bush was fully aware of the importance Mr Blair had attached to a breakthrough on climate change during his presidency of the G8.

"He [Bush] has known for a long time. He has known since before it was in the public domain that Tony had every intention of making climate change as well as Africa a top priority for our G8 year," she said. 

"But the Prime Minister's inability to gain concessions from his closest ally, following his backing for military action against Iraq, will be seen by some as a sign that Mr Blair does not have the influence he would like."

Tony Juniper, executive director of Friends of the Earth, said America was a "Neanderthal" when it came to the environment.

"As an absolute minimum, George Bush must acknowledge the work of his own scientists that climate change is caused by people," he said.

Mrs Beckett acknowledged Britain had no hope of persuading the US to sign up to Kyoto.

"The US signing up to Kyoto is off the agenda," she said.

The focus now was on creating a dialogue with the US and other major energy users, including India and China, about the way forward.