‘No miracles needed’: Prof Mark Jacobson on how wind, sun and water can power the world
The influential academic says renewables alone can halt climate crisis, with technologies such as carbon capture expensive wastes of time
“Combustion is the problem – when you’re continuing to burn something, that’s not solving the problem,” says Prof Mark Jacobson.
The Stanford University academic has a compelling pitch: the world can rapidly get 100% of its energy from renewable sources with, as the title of his new book says, “no miracles needed”.
Wind, water and solar can provide plentiful and cheap power, he argues, ending the carbon emissions driving the climate crisis, slashing deadly air pollution and ensuring energy security. Carbon capture and storage, biofuels, new nuclear and other technologies are expensive wastes of time, he argues.
“Bill Gates said we have to put a lot of
money into miracle technologies,” Jacobson says. “But we don’t – we have the technologies that we need. We have wind, solar, geothermal, hydro, electric cars. We have batteries, heat pumps, energy efficiency. We have 95% of the technologies right now that we need to solve the problem.” The missing 5% is for long-distance aircraft and ships, he says, for which hydrogen-powered fuel cells can be developed.
Jacobson believes progress towards a
100% renewable energy system can be fast: “The goal is 80% by 2030, and 100% by 2050. But, ideally, if we can get 80% by 2030, we should get 100% by 2035 to 2040.”
Storage can be batteries, pumped hydro,
flywheels, compressed air and lowering and raising heavy weights. Jacobson thinks batteries will win, but says others could contribute if they can compete on cost. New research indicates that
electric vehicle batteries alone could provide the short-term storage needed by global grids as early as 2030.
Jacobson also advocates heat storage for some buildings: “Storing heat in boreholes, aquifers or water pits is dirt cheap, excuse the pun. It’s less than $1 a kilowatt hour of storage.”
New nuclear plants are too slow to build and too expensive compared with wind and solar, in Jacobson’s view: “You end up waiting 15 to 20 years longer, for a seven to eight times higher electricity price – it just makes no sense. Even if they improve [build times], say to 12 years, that’s still way too long. We have cheaper, faster, safer technologies. Why waste time?”
Biofuels are also dismissed by Jacobson: “The biofuels push was really not helpful. They hold constant, or increase, air pollution and they use a huge amount of land.”
He is a little more measured when it comes to
direct air capture (DAC): technologies that can suck CO2 from the air for burial. It has no role today, he says, with spending on renewables far more cost effective in cutting emissions. But even when fossil fuel burning ends, many scientists have concluded that CO2 will have to be drawn from the air to avoid the worst effects of the climate crisis. At that point, Jacobson says, the costs of DAC should be compared with other ways to sequester carbon and limit global heating, such as reforestation and cutting emissions of other more powerful greenhouse gases, including methane from livestock and nitrous oxide from fertilisers.
Hybrid power park with solar panels and wind turbines in Sabugal, Portugal
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