Swedish environmental campaigner Greta Thunberg addresses politicians, media, and guests with the Houses of Parliament on April 23rd, 2019, in London, England.
Police officers remove protesters from a blockade on Waterloo Bridge during the second day of a coordinated protest by the Extinction Rebellion group on April 16th, 2019, in London, England.
A green sign demarcates London's Ultra Low Emissions Zone as the charge comes into effect on April 8th, 2019, in London, England.
A sculpture made from over 2,500 plastic bottles is seen outside the Department for Environment, Farming and Rural Affairs on February 25th, 2019, in London, England.
A series of drone sightings at London's Gatwick Airport caused over a hundred flights to be canceled or delayed as authorities struggled to respond to the potential danger.
Defending world champion Magnus Carlsen, a Norwegian, plays opponent American Fabiano Caruana in the final game of the World Chess Championship on November 28th, 2018, in London, England.
Pro-Brexit demonstrators gather outside Downing Street calling for a hard-line withdrawal from the European Union during the weekly cabinet meeting at Downing Street on October 16th, 2018, in London, England.
According to researchers, air pollution kills thousands in the city every year.
It's going to cost the city around $2 billion to increase the capacity of the four "Deep Tube" lines by 10 trains an hour.
A man bangs a drum as anti-Brexit demonstrators gather outside the Houses of Parliament on June 11th, 2018, in London, England.
Circus artists perform on Westminster Bridge to mark the 250th anniversary of the modern-day circus ahead of a reception in the Houses of Parliament on March 6th, 2018, in London, England.
Thousands of protesters march during the March4Women event on March 4th, 2018, in London, England.
A supermoon rises behind St. Paul's Cathedral and skyscrapers on January 31st, 2018, in London, United Kingdom.
Over the past few decades, some ex-convicts have turned to academia, aiming to put their experience "inside" to good use.
We canvassed the world of the social and behavioral sciences, looking for rising stars whose careers promise to make a lasting mark. We'll be profiling the top 30 throughout the month of April.