Politicians and commentators have their own pet theories and are probably too busy to do further homework.
Drawdown is a book edited by Paul Hawken (Penguin) in the USA that sets out 100 policies, each written by a specialist scientist, giving the gigatons of carbon dioxide equivalent that would be reduced. 80 of them are based on existing policies and technologies; for example Iran has halved its fertility rate and that of Bangladesh is less than replacement.
Below is a list of the top 20 and it is surprising that only 5 relate to energy production whereas 12 are based on food and land management. Top of the list is ‘refrigerant management’ covering the release of coolants*.
From Drawdown – Top 20 polices for carbon dioxide (or equivalent) reduction
*The Montreal Protocol (1987) and Kigali Amendment (2016) prevent further production of ozone-depleting refrigerants. Huge volumes remain within equipment and do 90% of their damage to the atmosphere – thousands of times worse than CO2 – on release. EU (&UK) regulations impose hefty fines for incorrect disposals of cooling equipment.