There are a lot of figures going around; 25 or 26 years is quite common, while one person claimed 140! 18 years seems to be the most popular, sometimes 18 years and 1 month; an incredibly precise claim in my opinion. But what about you? If you think the question can be answered, what would your answer be and on what evidence do you base it on? For how many years do you think we can say there has been no global warming?