Climate Tracker Pavlos Georgiadis pulled together this short video during after hanging around world leaders during the COP21 opening ceremony.

Leaders statements and announcements marked a new highpoint in the growing level of political momentum which has been on the rise for years. Among them, a coalition of vulnerable country leaders committed to the strongest ever call from UN member states.

On day one of UN summit in Paris, more than 150 world leaders have gathered to show support for a new global agreement. Climate Home is live-blogging their speeches and announcements. Greenpeace EnergyDesk compares how leaders positions in Paris have evolved. WRI is also posting regular updates and analysis on leaders statements.

The organizers have announced the final numbers for yesterday's mobilizations as part of the Global Climate Marches: 785,000 people were out in the streets, participating in more than 2300 events in more than 175 countries. Our updated Tree Alert with the final figures.

We issued a special Tree Alert for COP21 bringing together many of the relevant resources that are currently out there. Curated but comprehensive links to coverage, reports, press releases, toolkits, guides, websites, actions, plus quotes from partners and peers – plus loads of tweets, photos, videos, info visuals etc, as well as the best talking points we could come up.