this post was submitted on 25 Oct 2024
2 points (56.2% liked)

Climate - truthful information about climate, related activism and politics.

5395 readers
231 users here now

Discussion of climate, how it is changing, activism around that, the politics, and the energy systems change we need in order to stabilize things.

As a starting point, the burning of fossil fuels, and to a lesser extent deforestation and release of methane are responsible for the warming in recent decades: Graph of temperature as observed with significant warming, and simulated without added greenhouse gases and other anthropogentic changes, which shows no significant warming

How much each change to the atmosphere has warmed the world: IPCC AR6 Figure 2 - Thee bar charts: first chart: how much each gas has warmed the world. About 1C of total warming. Second chart: about 1.5C of total warming from well-mixed greenhouse gases, offset by 0.4C of cooling from aerosols and negligible influence from changes to solar output, volcanoes, and internal variability. Third chart: about 1.25C of warming from CO2, 0.5C from methane, and a bunch more in small quantities from other gases. About 0.5C of cooling with large error bars from SO2.

Recommended actions to cut greenhouse gas emissions in the near future:

Anti-science, inactivism, and unsupported conspiracy theories are not ok here.

founded 2 years ago
MODERATORS
silence7
2
Key to H2 economy: Toyota portable H2 cartridge (www.hydrogenfuelnews.com)
submitted 2 months ago by humanspiral@lemmy.ca to c/climate
11 comments fedilink hide all child comments
 

cross-posted from: https://lemmy.ca/post/31642688

for capacity: https://insideevs.com/news/738124/toyota-portable-hydrogen-cartridge-fcev/#:~:text=Gallery%3A%20Toyota%20Portable%20Hydrogen%20Cartridges&text=Toyota%20didn't%20say%20how,of%20161%20grams%20of%20hydrogen.

161grams = 5kwh+ of heat energy or close to 3kwh of electric only energy in a fuel cell.

For drones, ebikes, powerstations, this would be higher electric weight density than batteries. And solves ebike/powerstation charging on the go problem.

you are viewing a single comment's thread
view the rest of the comments
[–] humanspiral@lemmy.ca 1 points 2 months ago

Green H2 is inherently at a price disadvantage compared to green electricity.

Intermittent renewables are the cheapest. If you can consume electricity directly while it is produce, that is at cheapest rates. Batteries is one intermediate to get good power charge/discharge rates to absorb, even cheaper, surplus electricity that supports more renewables. H2 electrolysis is a way to absorb renewable production that would exceed 24 hour demand on some days, and allows for more renewables and batteries to keep the energy/batteries productive/monetized all of the time.

Even trucks and ships have a cost advantage in distributing H2 energy compared to electric wires. Pipelines even more. H2 distribution doubles as storage as well.

H2 is a few years ahead on horizon. Lowest hanging fruit is gasoline/diesel replacement, but alternative to electric grid expansion is real, with offshore wind the biggest gainer of going pure H2 electrolysis, and land based renewables expanding their footprints to have alternate sales options than an electric monopoly.