World leaders at the G8 summit have put back all announcements until Friday after a series of deadly blasts in London temporarily disrupted talks.
Blair has gone to London but the other leaders are still talking
The world leaders paused to condemn what they called "an attack on civilised peoples everywhere".
Talks then resumed in Tony Blair's absence as he travelled to London for police briefings.
Soon after his departure, developing nations called for action on climate change and for reduced trade barriers.
Before leaving for London, Mr Blair said it was "reasonably clear" the explosions were designed to coincide with the opening of the G8 and insisted it was the will of all the G8 leaders that the summit should continue regardless.
It was "particularly barbaric" that this should occur when people are meeting to tackle poverty, Mr Blair said.
UK Foreign Secretary Jack Straw travelled from London to Scotland to chair the talks until Mr Blair returns sometime on Thursday night.
Mr Straw was greeted by a joint declaration issued by the so-called G5 developing countries Brazil, China, India, Mexico and South Africa, who called for trade barriers to be removed as part of efforts to eradicate poverty.
"Trade distorting domestic support for agriculture in developed countries must be substantially reduced and all forms of export subsidies must be eliminated," the statement said.
The G5 also urged the G8 to take a lead in international action to combat climate change, insisting there is an urgent need to develop policies to help overcome "the inevitable adverse effects of climate change on the poor".
G8: PROGRESS SO FAR
G8 nations agreed to full debt cancellation for 18 countries, while African countries call for debt relief for all Africa
EU members have pledged to reach a collective aid target of 0.56% of GDP by 2010, and 0.7% by 2015
President Bush proposed doubling US aid to Africa over the next five years to $8.6bn (£4.8bn)
No deal yet made on lifting trade barriers
No progress made on climate change yet - the US has said it won't cut emissions but will look at clean technologies
Ahead of the attacks in London, Mr Blair and US President George W Bush had called for a new consensus on how to tackle climate change.
The two leaders said it was time to replace a focus on Kyoto-style curbs on greenhouse gas emissions with research into clean technology.
President Bush said fast-developing nations must take a role, and welcomed India and China's attendance at the G8.
Along with climate issues, G8 leaders are due to discuss global trade.
"Now is the time to get beyond the Kyoto period and develop a strategy forward that is inclusive of the developing nations," said President Bush.
WHAT IS THE G8?
Group of eight major industrialised states, inc Russia
Canada, France, Germany, Italy, Japan, Russia, UK, US
Originally set up to discuss trade and economic issues
Now leaders discuss global issues of the day
2005 Summit agenda
UK Prime Minister Tony Blair said there was "no point in going back over the Kyoto debate" and it was preferable to "bring people back into consensus together" on global warming.
With more than 10,000 police deployed, the summit is at the centre of one of the biggest security operations in UK history.
Demonstrations and Live8 concerts during the last week have sought to highlight the need for action on the issues of African aid, trade and climate change.
For many protesters and observers, the G8 summit is a defining moment in current world politics, amid increased calls for the world's richest countries to act now to help the world's poorest.
After the climate change talks, the G8 leaders are timetabled to discuss Middle East tensions, and hear from James Wolfensohn, the international envoy on Israel's pull out from Gaza.
African aid and trade talks are scheduled to dominate the talks on Friday.