By Celsias
Before the last assessment by the IPCC scientists were 90% agreed that humans were behind global warming but following the research for the latest report> That has now risen to 95% certain.
They have said that warming of the climate system is "unequivocal", and that since the 1950s, many of the observed changes are unprecedented.
More than 200 contributors to the assessment have concluded that CO2 concentrations have increased by 40% since pre-industrial times, primarily from fossil fuel emissions and secondarily from net land use change emissions.
The report warns that continued emissions of greenhouse gases will cause further warming and will change many components of the climate system.
Co-Chair of Working Group I, Thomas Stocker, said: "Heat waves are very likely to occur more frequently and last longer. As the Earth warms, we expect to see currently wet regions receiving more rainfall, and dry regions receiving less, although there will be exceptions".
"Limiting climate change will require substantial and sustained reductions of greenhouse gas emissions," he added. 
The Secretary of State for Energy and Climate Change in the UK Edward Davey said: "The gases emitted now are accumulating in the atmosphere and so the solutions must be set in motion today. The risks and costs of doing nothing today are so great, only a deeply irresponsible government would be so negligent.
"Without urgent action to cut greenhouse gas emissions this warming will continue, with potentially dangerous impacts upon our societies and economy. This strengthens the case for international leaders to work for an ambitious, legally binding global agreement in 2015 to cut carbon emissions," he added.
