As world powers and polluters end a two-day climate summit with heavy promises to prevent the global warming crisis from spiraling -- are declarations enough and what are the current flaws in Europe's climate policy? Rewatch our discussion with leading scientists, policymakers and entrepreneurship experts in the player above as we ask what Europe is doing to tackle climate change? The event was hosted by Euronews science correspondent and Climate Now series presenter Jeremy Wilks. On Thursday, United States President Joe Biden pledged to slash US greenhouse gas emissions by 50%-52% from 2005 levels by 2030, an effort it hopes will encourage other countries to change their climate change targets.