[8] Its purpose is to protect and promote public health by recruiting doctors, nurses and other healthcare professionals to advocate for better responses to climate change.

[19][20] It considers how methods that use collaboration can deal with climate change challenges, particularly for cutting carbon dioxide and improving air quality, by coal phase-out.

[4][21][22] In a letter to then Health Secretary Jeremy Hunt, the Alliance highlighted threats of extreme weather events and the need for preparedness.

[25] In June 2019 the Alliance was one of several concerned environmental organisations to write to the then Prime Minister, Theresa May, urging her to urgently commit to the recommendation of the independent Committee on Climate Change for the UK to set a target for net-zero greenhouse gas emissions before 2050.

[28] In early 2020 the Alliance supported Sir Simon Stevens' announcement that the NHS would aim for "net zero", call on hospitals to reduce carbon from their premises, switch to better asthma inhalers and encourage staff to take more active travel.