It’s been called the last, best chance to save the planet. The United Nations climate summit known as COP26 has drawn diplomats, heads of state, activists, lobbyists, environmentalists and even a Greenland iceberg to Glasgow, Scotland, this month as international negotiators seek to hammer out agreements to stave off catastrophic warming.

Inside the conference center, negotiators drank carbon-neutral coffee, Indigenous leaders in headdresses passed Prince Charles, and former president Barack Obama chastised China, Russia and the Republican Party. British Prime Minister Boris Johnson — a climate skeptic-turned-warrior — declared it was “one minute to midnight” but got caught napping on camera.

The summit has yielded pledges to halt deforestation by 2030, cut methane emissions 30 percent by the end of the decade and end financing for international fossil fuel projects. But outside the conference, 100,000 protesters marched through the wind and rain in Glasgow on Saturday, demanding more immediate action.

Climate activist Greta Thunberg has already dismissed the gathering as a failure. New reports show that greenhouse gases have made a comeback after their pandemic slump and that the world doesn’t spend nearly enough to adapt to environmental upheaval. Developing countries, which are already bearing the brunt of the devastating effects of climate change, are calling on wealthy countries to pay for the damage.

London bureau chief William Booth and climate reporter Sarah Kaplan answered your questions on Wednesday, including:

Read the transcript below.

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Claire Parker produced this Q&A.