Also do you have any evidence that CO2 does not influence temperature in the tropics? (theinconvenientskeptic.com)
Of course this is not an exact calculation and it doesn't include a lot of other items which influence temperature trends. (realclimate.org)
Understanding the factors that can influence temperatures near the tropical lower stratosphere is important for interpreting past climate change and projecting future changes. (judithcurry.com)