Why is newly renovated Reflecting Pool in Washington DC full of algae?

Why is newly renovated Reflecting Pool in Washington DC full of algae? The Lincoln Memorial Reflecting Pool in the US capital has turned green with algae days after it was refilled with water following renovations. President Donald Trump ordered the revamp last year, claiming the pool had been left in a poor condition by President Joe Biden. It's had issues with algae for decades. BBC Verify's Jake Horton has looked into what's behind the latest problem. Produced by Ian Aikman, graphics by Leo Scutt-Richter 5 hours ago United States Washington DC Donald Trump Share Save Dozens of Stanford grads walk out on Google CEO's speech Video filmed by the BBC showed dozens of people walking out, some carrying signs expressing concern about the company's controversial work with the US government. US & Canada 'The greatest day of my life' - Knicks fans celebrate in San Antonio New York's basketball team won the NBA championship for the first time in over 50 years after beating the Spurs in Texas. US & Canada 'People can change': Scandal-hit Platner on Maine primary win Graham Platner, whose campaign was plagued by scandals, has won the Maine primary and will run as the state's Democratic candidate for the US Senate in the November midterms. US & Canada Watch: Is the US ready to host the 2026 World Cup? The BBC’s Nada Tawfik reports on readiness concerns in the New York-New Jersey region, where eight matches will take place. US & Canada 'There is no one else' - Platner voters on backing the controversial Democrat The BBC spoke to voters in Maine on election day on who they want to challenge Republican Senator Susan Collins. US & Canada Watch: Moment Trump is booed during the national anthem at NBA Finals The US president later insisted the reaction inside the arena was "mostly cheers", describing the atmosphere as "loud" and "enthusiastic". US & Canada US truck carrying fireworks catches fire, sparking spectacular display No one was harmed in the incident, which saw motorists treated to an early Fourth of July show. US & Canada Is there an AI stock market bubble, and is it ready to burst? Despite the Iran war, inflation and debt fears, US markets keep hitting record highs, fueled largely by AI. BBC's Samira Hussain looks into whether that bubble will burst. US & Canada 'It looks black' - Americans react to Reflecting Pool's completed paint job After weeks of renovation, water has begun refilling the historic pool, which has been coated in a colour named "American flag blue". US & Canada Marilyn Monroe's jewellery, dresses and letters auctioned for her 100th birthday Hundreds of the Hollywood icon's personal possessions have been put up for auction in California. US & Canada Watch: Men seen entering NYC sewer manholes in surveillance footage The individuals are believed to be "treasure hunters" and urban explorers looking for valuables in the sewer system, police say. US & Canada Watch: Massive hailstones pound Denver in powerful storm Strong winds, intense ra