While most people know there's several different methods to produce hyrdogen with one end of the spectrum being green and created with electricity from renewables and the other end of the specturm using fossil fuels to create hyrdrogen. What people know less about is that hydrogen leaks into the atmosphere more easily and readily when it's being produced and stored than just about anything humans create. "As hydrogen refuelling infrastructure developers look to make progress, Taylor Wharton has warned that boil-off losses ranging from 10% to 50% continue to threaten hydrogen’s commercial case." https://www.h2-view.com/story/boil-off-losses-are-a-threat-to-hydrogen-refuellings-commercial-case-taylor-wharton/2128256.article/ And what you might be asking is, how does hydrogen in the atmosphere make climate change worse? Or at least that's what I asked myself when I was learning about hydrogen absorption in soils decreasing due to climate change causing soils to become dried out from increased drought, which is a huge problem due to climate change's increase in evapotranspiration. Global Impact of Low Soil Moisture on Microbial Hydrogen Uptake Turns out that a very dangerous, though short-lived, greenhouse gas in methane stays in the atmoshpere longer, as in breaks down slower when there's more atmospheric hyrdrogen availble: The negative effects of hydrogen on the atmosphere - SynerHy So thanks alot Toyota... Not only are you in last place among major auto makers converting to electric cars, not only do you spend more than other car makers lobbying governments to not phase out fossil fuels, but your push to use hydrogen fuel cells, if realized, would lead to a massive amount of hydrogen leaking into the atmosphere and making planet heating methane more abundant and slower to dissipate.