Presenting the most vivid evidence to date, the UN's IPCC report has warned that humans are responsible for changes to the earth's climate.
The UN IPPC report into climate change, due out tomorrow, will say scientists agree the world is getting warmer, and humans are to blame.
The government's top scientific advisor has warned of greater variability in UK weather as a result of climate change
Barack Obama has said in a White house video message that he will lay out a plan to reduce carbon pollution in climate change speech on Tuesday.
The growing import of goods from abroad instead of manufacturing them here has fuelled an increase in carbon emissions, according to the government's climate change advisers.
Official figures show that Britain's carbon emissions have fallen by around 20% over the last two decades, partly as a result of manufacturing moving overseas. But this data does not include the emissions produced in the making and transportation of goods we import to the UK.
The Committee on Climate Change report found that when emissions 'embedded' in the goods we consume are taken into account, there has actually been a 10% rise since 1993.
The report concludes that official figures should continue to track only the emissions produced within UK borders since this is what other countries do, but that imports should also be monitored.
The Government's outgoing chief scientific advisor has called for urgent action to tackle global warming, warning climate change will bring greater extremes in weather.
Professor Sir John Beddington said the effects of climate change were already being felt in Britain.
"In a sense we have moved from the idea of global warming to the idea of climate change, and that is rather important - yes, indeed, temperatures are increasing, but the thing that is going to happen is that we are going to see much more variability in our weather", Sir John told BBC Breakfast.
"I think you only have to look at the last few years to see how that is actually starting to manifest itself even in the UK", he added.
He said there were "massive problems" in the world of food, water and energy security as the global population increases, all of which would be exacerbated by climate change.
Even if effective action was taken now on global warming, Sir John stressed there would be "significant" climate change over the next 20 to 25 years as results of past global emissions.
Ed Davey has today commissioned another report on fracking - this time to gauge the risks of increased methane emissions.
“Emissions of methane - which is a potent greenhouse gas - are already subject to control, but I am today commissioning a study of the possible impacts of shale gas development on greenhouse gas emissions and climate change," he said.
Delegates from almost 200 nations have agreed to extend the Kyoto Protocol at UN climate talks in Doha, Qatar.
The first commitment period under the protocol, which commits industrialised countries to reducing their carbon emissions, expires this year.
The extension will cover the interim period between the first commitment period expiring and a new international emissions treaty due to come into force in 2020.
The research into the spread of the Asian tiger mosquito shows that parts of the UK could become hot-spots between 2030 and 2050.
The mosquito has been introduced into Europe from Asia via goods shipments, mainly used tyres and bamboo.
Climate change is now shifting conditions suitable for the insect from southern Europe to central north-western areas.
The mosquito could survive in water butts and vases, and may find winter protection in greenhouses, said the researchers.
Scientists used climate models to predict how changing conditions could affect Asian tiger mosquito distribution.
Theresearch shows that parts of the UK could become hot-spots of Asian tiger mosquito activity between 2030 and 2050.
– Report by Liverpool Uni's Dr Cyril Caminade in Journal of the Royal Society Interface
"Mosquito climate suitability has significantly increased over the southern UK, northern France, the Benelux, parts of Germany, Italy, Sicily and the Balkan countries."
A mosquito that spreads tropical diseases including dengue fever may be poised to invade the UK because of climate change, experts have warned.
The Asian tiger mosquito, Aedes albopictus, has already been reported in France and Belgium and could be migrating north as winters become warmer and wetter.