Green house effect and global warming

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- [Instructor] In this video, we're gonna talk about the greenhouse effect and also the greenhouse gases, which cause the greenhouse effect. Now let's just start with a basic idea. Imagine if earth had no atmosphere, what would happen? Well, you have the sun, which is on average, 93 million miles away. It's sending electromagnetic radiation our way to the surface of the earth. We're actually getting a very, very small fraction of the total electromagnetic radiation of the sun. And then that would heat up the surface of the earth. Now, what I have always found mind-blowing is anything with temperature will emit electromagnetic radiation. And so it's emitting some of that energy, it's losing some of that energy to electromagnetic radiation. So the surface would be releasing that and it would go out into space. But now let's introduce the idea of an atmosphere. And in particular, we're gonna think about our lower atmosphere, which starts at the surface and goes up to about five to nine miles in altitude, often known as the troposphere. Now the troposphere has molecules in it, has gases in it like carbon dioxide, like water vapor, like methane. Others include nitrous oxide and chlorofluorocarbons. You don't have to know the chemical formula of all of these things, but what's interesting about these gases that are in the lower atmosphere is that they can absorb some of those electromagnetic waves that the surface of the earth is emitting. So some of that energy will make it out...

One of the researchers said the analysis was a "timely wake-up call" that the pace and scale of climate action has been insufficient, and it comes as Given the speed at which the The authoritative source of scientific information on the state of the climate is the UN's Intergovernmental Panel on Climate Change (IPCC) but the turnaround time for its major assessments is five or ten years, and that creates an "information gap," particularly when climate indicators are changing rapidly. In an initiative being led by the University of Leeds, the scientists have developed an Critical decade for climate change The Indicators of Global Climate Change Project is being coordinated by Professor Piers Forster, Director of the Priestley Centre for Climate Futures at Leeds. He said, "This is the critical decade for climate change. Decisions made now will have an impact on how much temperatures will rise and the degree and severity of impacts we will see as a result. "Long-term warming rates are currently at a long-term high, caused by highest-ever levels of "We need to be nimble footed in the face of climate change. We need to change policy and approaches in the light of the latest evidence about the state of the climate system. Time is no longer on our side. Access to up-to-date information is vitally important." Writing in the journal Earth System Science Data, the scientists have revealed how key indicators have changed since the publication of the IPCC's Sixth Assessment Working Gr...