This week on Dezeen, we marked Earth Day by showcasing 50 architects and designers who are pushing the boundaries of sustainable architecture and design.

Those working in the built environment have a key role to play when it comes to protecting biodiversity and reducing carbon emissions.

Among the people working to make a change are Alexandra Hagen, the CEO of Swedish studio White Arkitekter, which has a portfolio of structures that go beyond net-zero to carbon negative, and Arthur Huang, whose company Miniwiz focuses on democratising the recycling process.

In architecture news this week, British architect Norman Foster offered to help rebuild Kharkiv, a Ukrainian city that has suffered extensive damage during the Russian invasion.

Foster, who is the founder of UK studio Foster + Partners, said he will "assemble the best minds with the best planning, architectural, design, and engineering skills in the world to bear on the rebirth of the city of Kharkiv".

In London, the controversial plan to demolish and replace an art deco building that houses a Marks & Spencer flagship store was halted by UK housing secretary Michael Gove.

The planning process has been paused until the government has gone over the proposal for the redevelopment. It had been criticised for wasting the embodied carbon of the existing building and for heritage reasons.

To mark the 420 cannabis celebration, we rounded up eight well-designed products for marijuana smokers. These include doughnut-shaped pipes, packaging that resembles lego bricks and marijuana accessories modelled on vintage crystal vessels.

Cannabis is one of the fastest-growing industries in the US, which began legalising the drug in 2012, and a number of international designers are capitalising on the trend.

In another roundup this week, we looked at nine buildings by postmodern architect John Outram, including his "Temple of Storms" pumping station (above).

The buildings were chosen by architectural historian Geraint Franklin, who is the author of Outram's biography, simply named John Outram.

A new exhibition by artists Ben Langlands and Nikki Bell looks at architects' attempts to create utopias. The duo spoke to Dezeen in an exclusive interview, explaining how architecture plays a large role in their art.

"For us, architecture is a way of getting to grips with who we are as people on the personal level, the social level and the cultural level," said Langlands.

Popular projects this week include a bowl-like community centre designed by Sou Fujimoto, a Chilean home with a triangular skylight and a Portuguese farmhouse extension.

Our lookbooks this week focused on homes with welcoming terraces and social kitchen interiors with built-in seating.

This week on Dezeen

This week on Dezeen is our regular roundup of the week's top news stories. Subscribe to our newsletters to be sure you don't miss anything.