Thousands of people will visit London tomorrow to demonstrate their concern about global warming.
Under the banner of the Stop Climate Chaos they will descend on Trafalgar Square for a rally to urge Government to do more.
A vast spectrum of organisations and individuals have already booked their tickets on coaches leaving Birmingham.
Groups include Oxfam, the West Midlands Woodland Trust, CAFOD, WWF, RSPB, trade unions and Friends of the Earth.
The rally follows a report published this week by economist Sir Nicholas Stern suggesting global warming could shrink the global economy by 20 per cent.
Stuart Richardson, of Stop Climate Chaos, organising two coaches from Birmingham, said the desire to do something to stop climate change was growing.
Mr Richardson, a supply teacher of maths and physics from Sutton Coldfield, said: "The weight of scientific opinion is united. The Government's report was an issue a minority layer had taken up but it is now central to world politics.
"It is in the papers, we do assemblies at school, and 20 cities around the world this year are holding demonstrations, so it is becoming very much an international movement.
"People are recognising this is a profound thing, it is going to be like a world war in terms of destruction and chaos."
The rally is being staged on the eve of critical climate talks in Nairobi, Kenya.
"The rally gives people the opportunity to send a message to Tony Blair to stand up and stop climate chaos.
"The scale of reductions we need, we can't do it purely with individual lifestyle changes – it needs to be structural," he said. "We need to massively boost public transport.
"We think Government should introduce free public transport. Green taxes are very regressive and impact on poorer people."
Rev Hugh Burton, parish priest at St Chad's Church in Kidderminster, is attending. "I've had a growing awareness
climate change is a major problem for a few years and I think the will behind the Government and individuals has lagged behind the knowledge we have to change things. The Government has a long way to go."
The father-of-four has just changed his electricity supplier to one which supplies electricity that is 100 per cent renewable.
"We recycle as much as we can and compost in the garden and we take public transport. From a Church point of view we are stewards of God's creation.
"It is what he has given us. I talk about it during services and occasionally write articles about it."
At 1pm campaigners will gather at Trafalgar Square. There will be music, street performers, a gospel choir, speakers and special guests.
Tickets on the coaches cost #12 for the waged and #6 for the unwaged. Those interested should call 0777 594 2841.
School caretaker Pete Duffy, aged 48, has become increasingly concerned about global warming. A father of two teenage sons from Erdington, he has started incorporating recycling and sustainable transport into family life.
He wants to do more to help – and wants Government to do more, too.
"Recently global warming has made headlines on TV and in the media and I've really started to be active in the movement," he says.
"We recycle bottles and paper and use low energy lightbulbs and, where viable, public transport.
"I’d like influence on packaging and where supermarket goods come from. We watch where fruit and vegetables come from. In some supermarkets all you get is apples from the other side of the world when they are rotting in Midland orchards. Finding locally produced food can be expensive and time consuming, and if you have a job and a family it's difficult.
"The thing that frustrates me most is the complacency that reigns when the scientific data points in one direction. This is especially so in Birmingham, with the choking roads and lack of decent public transport.
"Nationally, Government only seems to be facing this now because climate change will affect the economy. They and big business have made this problem and they are just looking at it as a cash cow to rake in more money."