Comparing GHG emissions generated by different fuel sources shows that solar PV is better than gas and coal, but much worse than nuclear and wind power. A solar PV system's use of batteries increases total emissions dramatically. Compared to nuclear or fossil-fuel plants, PV has little "energy return on energy Invested." [13]
7. Going off-grid requires batteries, which are toxic. Lead-acid batteries are the least expensive option; they also have a short life and lower depth of discharge (capacity) than other options. Lead is a potent neurotoxin that causes irreparable harm to children's brains. Internationally, because of discarded lead-acid batteries, one in three children have dangerous lead levels in their blood. [14] Lithium-ion batteries have a longer lifespan and capacity compared to lead acid batteries. However, lithium processing takes water from farmers and poisons waterways. [15] Lithium-ion batteries are expensive and toxic when discarded. Saltwater batteries do not contain heavy metals and can be recycled easily. However, they are relatively untested and not currently manufactured.
8. Huge solar arrays require huge battery electric-storage systems (BESS). A $150 million battery-storage system can provide 100 MW for, at most, one hour and eighteen minutes. This cannot replace large-scale delivery of electricity. Then, since BESS lithium-ion batteries must be kept cool in summer and warm in winter, they need large heating, ventilation, air- conditioning (HVAC) systems. (If the Li-ion battery overheats, the results are catastrophic.) Further, like other batteries, they lose their storage capacity over time and must be replaced--resulting in more extraction, energy and water use, and toxic waste. [16]
9. Solar PV systems cannot sufficiently power energy guzzlers like data centers, access networks, smelters, factories or electric-vehicle [EV] charging stations. If French drivers shifted entirely to EVs, the country's electricity demands would double. To produce this much electricity with low-carbon emissions, new nuclear plants would be the only option. [17] In 2007, Google boldly aimed to develop renewable energy that would generate electricity more cheaply than coal-fired plants can in order to "stave off catastrophic climate change." Google shut down this initiative in 2011 when their engineers realized that "even if Google and others had led the way toward a wholesale adaptation of renewable energy, that switch would not have resulted in significant reductions of carbon dioxide emissions". Worldwide, there is no level of investment in renewables that could prevent global warming." [18]
10. Solar arrays impact farming. When we cover land with solar arrays and wind turbines, we lose plants that can feed us and sequester carbon. [19]
11. Solar PV systems' inverters "chop" current and cause "dirty" power, which can impact residents' health. [20]
12. At the end of their usable life, PV panels are hazardous waste. The toxic chemicals in solar panels include cadmium telluride, copper indium selenide, cadmium gallium (di)selenide, copper indium gallium (di)selenide, hexafluoroethane, lead, and polyvinyl fluoride. Silicon tetrachloride, a byproduct of producing crystalline silicon, is also highly toxic. In 2016, the International Renewable Energy Agency (IRENA) estimated that the world had 250,000 metric tons of solar-panel waste that year; and by 2050, the amount could reach 78 million metric tons. The Electric Power Research Institute recommends not disposing of solar panels in regular landfills: if modules break, their toxic materials could leach into soil. [21] In short, solar panels do not biodegrade and are difficult to recycle.
To make solar cells more recyclable, Belgian researchers recommend replacing silver contacts with copper ones, reducing the silicon wafers' (and panels') thickness, and removing lead from the panels' electrical connections. [22]
13. Solar farms warm the Earth's atmosphere.
Only 15% of sunlight absorbed by solar panels becomes electricity; 85%
returns to the environment as heat. Re-emitted heat from large-scale
solar farms affects regional and global temperatures. Scientists'
modeling shows that covering 20% of the Sahara with solar farms (to
power Europe) would raise local desert temperatures by 1.5Â degreesC (2.7Â degreesF). By
covering 50% of the Sahara, the desert's temperature would increase by
2.5Â degreesC (4.5Â degreesF). Global temperatures would increase as much as 0.39Â degreesC with
polar regions warming more than the tropics, increasing loss of Arctic
Sea ice. [23] As governments create "green new deals," how should they
use this modeling?
Other areas need consideration here: dust and dirt that accumulate on panels decreases their efficiency; washing them uses water that might otherwise go to farming. Further, Saharan dust, transported by wind, provides vital nutrients to the Amazon's plants and the Atlantic Ocean. Solar farms on the Sahara could have other global consequences. [24]
14. Solar PV users may believe that they generate "zero-emitting," "clean" power without awareness of the GHGs, extractions, smelting, chemicals and cargo shipping involved in manufacturing such systems--or the impacts of their disposal. If our only hope is to live with much less human impact to ecosystems, then how/could we decrease solar PVs' impacts? Could we stop calling solar PV power systems "green" and "carbon-neutral?" If not, why not?
REFERENCES
1. Schwarzburger, Heiko, "The trouble with silicon," PV Magazine, September 15, 2010.
2. Troszak, Thomas A., "Why do we burn coal and trees to make solar panels?" August, 2019. Click Here
3. Kato, Kazuhiko, et. al., "Energy Pay-back Time and Life-cycle CO2 Emission of Residential PV Power System with Silicon PV Module," Progress in Photovoltaics: Research and Applications, John Wiley & Sons, 1998.
4. Gibbs, Jeff and Michael Moore, "Planet of the Humans," 2019 documentary about the ecological impacts and money behind "renewable" power systems, including solar, wind and biomass.
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