Fewer than 300 human beings have visited the International Space Station, and an even smaller number have spent more than 150 days living there. John Yang speaks with Cady Coleman, one of those select few astronauts, about her new book, 'Sharing Space: An Astronaut's Guide to Mission, Wonder, and Making Change.' PBS News is supported by - https://www.pbs.org/newshour/about/funders

Google announced this week it is well behind on a pledge to all but eliminate its net carbon emissions by 2030. The company's greenhouse gas outflow has increased in recent years mainly due to artificial intelligence and the energy required to power it. The AI arms race has experts worried about its climate consequences for energy and water. Economics correspondent Paul Solman reports. PBS News is supported by - https://www.pbs.org/newshour/about/funders

A major issue in Britain's general election is the cost of living crisis, caused by spiking inflation following the Russian invasion of Ukraine. That has put pressure on the country's pledge, written into law, to become carbon neutral by 2050. Fred de Sam Lazaro reports from Aberdeen, Scotland, in partnership with the Pulitzer Center. PBS News is supported by - https://www.pbs.org/newshour/about/funders

In the past two decades, the oyster population in Mississippi's Gulf waters has been devastated by both natural and manmade disasters. Among those working to restore oyster habitats is ninth grader Demi Johnson, who was recently recognized by the National Geographic Society for growing more than 1,000 oysters, which are likely to spawn millions more. John Yang speaks with Johnson about her work. PBS News is supported by - https://www.pbs.org/newshour/about/funders

The rise of artificial intelligence is requiring faster and bigger computations for even simple tasks compared to, say, a Google search. It's adding to the demand for more internet data centers, but these facilities come at a big environmental cost, especially for the communities that host them. Science journalist Sachi Kitajima Mulkey joins Ali Rogin to discuss. PBS News is supported by - https://www.pbs.org/newshour/about/funders

In our news wrap Saturday, Israeli Prime Minister Netanyahu called Biden's proposal to end the war in Gaza a "nonstarter" until Israel's conditions are met, a barrage of Russian missiles and drones targeted Ukraine's power grid, South Africa's ANC party lost its majority in parliament for the first time in 30 years, and another attempt to launch Boeing's first astronaut flight was called off. PBS News is supported by - https://www.pbs.org/newshour/about/funders

Nearly 115,000 people are currently waiting for a new organ. But the shortage crisis is nothing new, as 5,600 people die each year waiting for an organ. Ali Rogin spoke with Barry Friedman, the former executive director of the AdventHealth Transplant Institute, about what can be done to revamp the nation's organ donation and transplant process. PBS News is supported by - https://www.pbs.org/newshour/about/funders

As the planet warms and sea levels rise, eighty-five percent of Generation Z is concerned about climate change, according to a January Marist poll. In response, states like California, Connecticut and New Jersey are teaching kids about climate change in the classroom. Lauren Madden, a professor of elementary science education at the College of New Jersey, joins Laura Barrón-López to discuss. PBS News is supported by - https://www.pbs.org/newshour/about/funders

The outbreak of bird flu in the U.S. has alarmed researchers and prompted new efforts to track the virus that's already killed millions of birds from Europe to Antarctica. As H5N1 continues to jump into mammals, many scientists are concerned that we're not watching closely enough as this virus spreads. William Brangham reports. A warning: This story contains scenes of animals in distress. PBS News is supported by - https://www.pbs.org/newshour/about/funders

In our news wrap Saturday, Israel issued more evacuation orders forcing tens of thousands of Palestinians to flee Rafah, Russian forces took control of five villages outside Kharkiv amid a renewed offensive in Ukraine's northeast, flash floods in Afghanistan, Brazil and Kenya have killed hundreds of people, and unusually strong solar storms are producing brilliant northern lights on Earth. PBS News is supported by - https://www.pbs.org/newshour/about/funders