Youth climate activist Greta Thunberg has made a surprise visit to London’s solidarity sit-in for writer and activist Alaa Abdel-Fattah, who is being imprisoned by Egypt. Alaa’s sister Sanaa Seif began her sit-in protest outside the UK’s Foreign Commonwealth and Development Office almost two weeks ago. Seif is calling on UK Foreign Minister James Cleverly to secure the release of her brother, who holds British citizenship, after 200 days of hunger strike and years of incarceration. Just another morning. 212 days on hunger strike for Alaa. A visit to the sit-in by @GretaThunberg ahead of #COP27…