Concerns over Glencore's environmental credentials are partly down to its coal business. Fossil fuels represent a large chunk of the miner's sales. In the run-up to the AGM, Glencore made a bid for Canadian coal miner Teck Resources [TECK]. While that bid was unsuccessful, the two companies are still in discussions over Glencore buying Teck's coal business. Glencore plans to spin off its and Teck's coal operations as a separate entity. Glencore said it plans to close its thermal coal mines by the middle of the 2040s.