However, several rebuttal reports have already taken-to-task that UK study:
The Absurdity of Measuring Breath for Climate Change   Click Here  
Now scientists say your breathing might affect the climate   Click Here 
Scientists Discover Animals Breathe    Click Here 

Seldom will reports use the word stupid but here’s one quoted: “ how could people be this stupid?”

It has been known for quite a while, in Junior High School classes, that man exhales CO2, and other components such as methane. Just like cows. camels, horses, wild bison, birds, ostriches, & kangaroos. Even rodents, beetles, ants and other insects are also exhaling.   

Consider that the insects number about 10 quintillion, birds about 50 billion. Even about 35 trillion fish and sea-life are involved.  Man is far down on the list, with about 8 billion individuals exhaling.   

One report challenged methane’s role in climate saying: “If belches of methane can cause a climate crisis, how did the planet not boil away when 30 million bison roamed the plains of North America? Why was the climate idea (apparently) when the vast herds of Wildebeest roamed Africa?”

And when looking at the study numbers, they are incredibly small fractions, less then 1 full percentage point. “ 0.05% and 0.1% to the UK’s total emissions of CH4 and N2O, respectively“

Also, I’d agree with this rebuttal summary: “In conclusion, this study is emblematic of the absurd lengths to which climate alarmism has gone. It represents a worrying trend in the climate debate. There is a dire need for a return to scientific sanity and rational discourse in addressing environmental issues.”

How often has mankind been bombarded with predictions by self-styled experts for population declines, for famines, for any number of annihilations, even extinction.  Those so called "experts" like Paul Ehrlich have all been wrong.    

And the climate activists have also had a multitude of false predictions. Natural climate swings seem to offer the more successful climate analyses.