Baked Beans & Green house gasses

I wonder if there is someone out there who could help me.  Looking at pictures of vegan demonstrators outside a butchers shop, purporting to be protesting about the amount of greenhouse gases produced by the UK cattle herd I did wonder how much greenhouse gas is produced in the UK by those who eat baked beans?  I mean we eat 540 million cans of the stuff a year and we all know what the result of eating baked beans is don't we?

Apart though from the gas we emit through farting after eating them there must also be considerable 'green house' gas caused by growing them, processing them and transporting them. If there is someone with a scientific bent of mind who reads this could they please come up with a figure -I -and the entire rural and meat eating community would be eternally grateful. Because the time has come to stop sitting down and allowing the Vegans and other so called 'activists' to dictate the news with their extreme agendas - we need to fight back.