Factbox - Merkel's coalition finalises German landmark climate plan

German Chancellor Angela Merkel gives a speech during a ceremony for the "Jugend Forscht" (Young Researcher) award in the chancellery in Berlin, Germany, September 19, 2019. REUTERS/Fabrizio Bensch

BERLIN (Reuters) - German Chancellor Angela Merkel's coalition parties start marathon talks on Thursday to agree a landmark climate action plan designed to help Europe's biggest economy meet its CO2 emission reduction targets by 2030.

The package is also a major test for the alliance between Merkel's conservatives and the Social Democrats (SPD) who have made clear that it could make or break their government. Both sides need to show their backers the deal is a success.