Architects and built environment sustainability experts have expressed frustration at the slow pace of global action to reduce carbon emissions as the COP27 climate-change summit kicks off in Egypt.

British architect and co-initiator of campaign group Architects Declare Michael Pawlyn told Dezeen it was "hard to find causes for optimism".

"It is very hard to be hopeful," echoed Kenyan architect Kabage Karanja, pointing to a failure to properly involve young people and a lack of will from richer countries to find the money to deal with the effects of global heating.