Bill Gates – TED Talk TRANSCRIPT
I’m going to talk today about energy and climate. And that might seem a bit surprising, because my full-time work at the foundation is mostly about vaccines and seeds, about the things that we need to invent and deliver to help the poorest 2 billion live better lives.
But energy and climate are extremely important to these people. In fact, more important than to anyone else on the planet. The climate getting worse means that many years, their crops won’t grow: there will be too much rain, not enough rain; things will change in ways their fragile environment simply can’t support.
And that leads to starvation, it leads to uncertainty, it leads to unrest.
So, the climate changes will be terrible for them. Also, the price of energy is very important to them. In fact, if you could pick just one thing to lower the price of to reduce poverty, by far you would pick energy.
Now, the price of energy has come down over time. Really advanced civilization is based on advances in energy. The coal revolution fueled the Industrial Revolution, and, even in the 1900s, we’ve seen a very rapid decline in the price of electricity. And that’s why we have refrigerators, air-conditioning; we can make modern materials and do so many things.
And so, we’re in a wonderful situation with electricity in the rich world. But as we make it cheaper — and let’s say, let’s go for making it twice as cheap — we need to meet a new constraint, and that constraint has to do with CO2.
CO2 is warming the planet, and the equation on CO2 is actually a very straightforward one. If you sum up the CO2 that gets emitted, that leads to a temperature increase, and that temperature increase leads to some very negative effects: the effects on the weather; perhaps worse, the indirect effects, in that the natural ecosystems can’t adjust to these rapid changes, and so you get ecosystem collapses.
Now, the exact amount of how you map from a certain increase of CO2 to what temperature will be, and where the positive feedbacks are — there’s some uncertainty there, but not very much.
And there’s certainly uncertainty about how bad those effects will be, but they will be extremely bad. I asked the top scientists on this several times: Do we really have to get down to near zero? Can’t we just cut it in half or a quarter?
And the answer is, until we get near to zero, the temperature will continue to rise. And so that’s a big challenge.
It’s very different than saying, “We’re a twelve-foot-high truck trying to get under a ten-foot bridge, and we can just sort of squeeze under.”
This is something that has to get to zero.
Now, we put out a lot of carbon dioxide every year — over 26 billion tons. For each American, it’s about 20 tons. For people in poor countries, it’s less than one ton. It’s an average of about five tons for everyone on the planet.
And somehow, we have to make changes that will bring that down to zero. It’s been constantly going up. It’s only various economic changes that have even flattened it at all. So we have to go from rapidly rising to falling, and falling all the way to zero.
This equation has four factors, a little bit of multiplication. So you’ve got a thing on the left, CO2, that you want to get to zero, and that’s going to be based on the number of people, the services each person is using on average, the energy, on average, for each service, and the CO2 being put out per unit of energy.
So let’s look at each one of these, and see how we can get this down to zero. Probably, one of these numbers is going to have to get pretty near to zero. That’s back from high school algebra. But let’s take a look.