The Guardian : “It is nearly 27 years now since a Nasa scientist testified before the US Senate that the agency was 99% certain that rising global temperatures were caused by the burning of fossil fuels.”  

“And the Senate still has not got it – based on the results of three symbolic climate change votes on Wednesday night.”  

“The Senate voted virtually unanimously that climate change is occurring and not, as some Republicans have said, a hoax – but it defeated two measures attributing its causes to human activity.”  

“But the Senate voted down two measures that attributed climate change to human activity – and that is far more important. Unless Senators are prepared to acknowledge the causes of climate change, it is likely they will remain unable and unwilling to do anything about it.”