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| COP21: City mayors discuss green solutions | COP21: City mayors discuss green solutions |
| (about 14 hours later) | |
| Cities could use water from rivers and the sea to stay cool as the climate heats, city mayors have been told. | Cities could use water from rivers and the sea to stay cool as the climate heats, city mayors have been told. |
| Carbon emissions from air-conditioning are expected to soar as temperatures climb and people become richer. | Carbon emissions from air-conditioning are expected to soar as temperatures climb and people become richer. |
| But at a global mayors summit, Paris is showcasing a simple technology using water piped from the Seine to cool apartments near the Champs Elysees. | But at a global mayors summit, Paris is showcasing a simple technology using water piped from the Seine to cool apartments near the Champs Elysees. |
| London Mayor Boris Johnson said he wanted London to follow suit by cooling buildings using water from the Thames. | London Mayor Boris Johnson said he wanted London to follow suit by cooling buildings using water from the Thames. |
| "I don't like to admit it - but the French are ahead of us on this," he confessed. | "I don't like to admit it - but the French are ahead of us on this," he confessed. |
| The system works by taking water from the river and piping it round people's homes like ordinary piped water air conditioning. In summer a heat pump is used to make the water even cooler by employing technology similar to a fridge. | The system works by taking water from the river and piping it round people's homes like ordinary piped water air conditioning. In summer a heat pump is used to make the water even cooler by employing technology similar to a fridge. |
| The mayors meeting in Paris City Hall is timed to coincide with the UN climate summit. It brings together half of the 80 mega-city mayors who are working together to tackle climate change. | The mayors meeting in Paris City Hall is timed to coincide with the UN climate summit. It brings together half of the 80 mega-city mayors who are working together to tackle climate change. |
| The chairman of the group, Eduardo Paes, Mayor of Rio, said the mayors represented 600m people and a quarter of the global economy. | The chairman of the group, Eduardo Paes, Mayor of Rio, said the mayors represented 600m people and a quarter of the global economy. |
| "We can be very effective," he said. "Sometimes governments move slowly - we can often move more quickly." | "We can be very effective," he said. "Sometimes governments move slowly - we can often move more quickly." |
| The mayors said they had learned from each other to spread green solutions round the world. They claim to have collectively made 10,000 climate initiatives since 2009. | The mayors said they had learned from each other to spread green solutions round the world. They claim to have collectively made 10,000 climate initiatives since 2009. |
| They spoke about their favourite initiatives: | They spoke about their favourite initiatives: |
| Boris Johnson's team said since the Mayor was elected in 2008, carbon emissions in London were down by 14%, even though population had swelled. | Boris Johnson's team said since the Mayor was elected in 2008, carbon emissions in London were down by 14%, even though population had swelled. |
| He said a major preoccupation was to find ways of finding a low-carbon way to provide the heating and cooling from natural gas, which made up nearly 50% of the city's emissions. | He said a major preoccupation was to find ways of finding a low-carbon way to provide the heating and cooling from natural gas, which made up nearly 50% of the city's emissions. |
| Darren Johnson, Green member for the London Assembly, told BBC News: "On the whole Boris Johnson has been a real disappointment. He has expressed climate sceptic views and failed to meet most of the targets in his (climate) strategies." | Darren Johnson, Green member for the London Assembly, told BBC News: "On the whole Boris Johnson has been a real disappointment. He has expressed climate sceptic views and failed to meet most of the targets in his (climate) strategies." |
| The global commission advised by Lord Stern concluded recently that climate change could only be tackled if new cities to house a burgeoning population could be planned less like Los Angeles and more like Paris. | The global commission advised by Lord Stern concluded recently that climate change could only be tackled if new cities to house a burgeoning population could be planned less like Los Angeles and more like Paris. |
| Climate change remedies 'affordable' | Climate change remedies 'affordable' |
| Follow Roger on Twitter @rharrabin | Follow Roger on Twitter @rharrabin |
| UN climate conference 30 Nov - 11 Dec 2015 | UN climate conference 30 Nov - 11 Dec 2015 |
| COP 21 - the 21st session of the Conference of the Parties - will see more than 190 nations gather in Paris to discuss a possible new global agreement on climate change, aimed at reducing greenhouse gas emissions to avoid the threat of dangerous warming due to human activities. | COP 21 - the 21st session of the Conference of the Parties - will see more than 190 nations gather in Paris to discuss a possible new global agreement on climate change, aimed at reducing greenhouse gas emissions to avoid the threat of dangerous warming due to human activities. |
| Explained: What is climate change? | Explained: What is climate change? |
| In video: Why does the Paris conference matter? | In video: Why does the Paris conference matter? |
| Analysis: Latest from BBC environment correspondent Matt McGrath | Analysis: Latest from BBC environment correspondent Matt McGrath |
| More: BBC News climate change special report | More: BBC News climate change special report |
| Do you have a question about climate change? Our correspondent Matthew Price will answer a selection of your questions in Texas, USA on Friday 4 December at 1400 GMT on Facebook and 1700 GMT on the BBC News website. | |
| Here's how to send your questions: | |
| Or comment here: |