carbon emissions

us’s-power-grid-continues-to-lower-emissions—everything-else,-not-so-much

US’s power grid continues to lower emissions—everything else, not so much

carbon emissions, coal, electric grid, Energy, natural gas, Science, solar, Sustainability, Wind / /

Down, but not down enough —

Excluding one pandemic year, emissions are lower than they’ve been since the 1980s.

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Graph showing total US carbon emissions, along with individual sources. Most trends are largely flat or show slight declines.

On Thursday, the US Department of Energy released its preliminary estimate for the nation’s carbon emissions in the previous year. Any drop in emissions puts us on a path that would avoid some of the catastrophic warming scenarios that were still on the table at the turn of the century. But if we’re to have a chance of meeting the Paris Agreement goal of keeping the planet from warming beyond 2° C, we’ll need to see emissions drop dramatically in the near future.

So, how is the US doing? Emissions continue to trend downward, but there’s no sign the drop has accelerated. And most of the drop has come from a single sector: changes in the power grid.

Off the grid, on the road

US carbon emissions have been trending downward since roughly 2007, when they peaked at about six gigatonnes. In recent years, the pandemic produced a dramatic drop in emissions in 2020, lowering them to under five gigatonnes for the first time since before 1990, when the EIA’s data started. Carbon dioxide release went up a bit afterward, with 2023 marking the first post-pandemic decline, with emissions again clearly below five gigatonnes.

The DOE’s Energy Information Agency (EIA) divides the sources of carbon dioxide into five different sectors: electricity generation, transportation, and residential, commercial, and industrial uses. The EIA assigns 80 percent of the 2023 reduction in US emissions to changes in the electric power grid, which is not a shock given that it’s the only sector that’s seen significant change in the entire 30-year period the EIA is tracking.

With hydro in the rearview mirror, wind and solar are coming after coal and nuclear.

With hydro in the rearview mirror, wind and solar are coming after coal and nuclear.

What’s happening with the power grid? Several things. At the turn of the century, coal accounted for over half of the US’s electricity generation; it’s now down to 16 percent. Within the next two years, it’s likely to be passed by wind and solar, which were indistinguishable from zero percent of generation as recently as 2004. Things would be even better for them if not for generally low wind speeds leading to a decline in wind generation in 2023. The biggest change, however, has been the rise of natural gas, which went from 10 percent of generation in 1990 to over 40 percent in 2023.

A small contributor to the lower emissions came from lower demand—it dropped by a percentage point compared to 2022. Electrification of transport and appliances, along with the growth of AI processing, are expected to send demand soaring in the near future, but there’s no indication of that on the grid yet.

Currently, generating electricity accounts for 30 percent of the US’s carbon emissions. That places it as the second most significant contributor, behind transportation, which is responsible for 39 percent of emissions. The EIA rates transportation emissions as unchanged relative to 2022, despite seeing air travel return to pre-pandemic levels and a slight increase in gasoline consumption. Later in this decade, tighter fuel efficiency rules are expected to drive a decline in transportation emissions, which are only down about 10 percent compared to their 2006 peak.

Buildings and industry

The remaining sectors—commercial, residential, and industrial—have a more complicated relationship with fossil fuels. Some of their energy comes via the grid, so its emissions are already accounted for. Thanks to the grid decarbonizing, these would be going down, but for business and residential use, grid-dependent emissions are dropping even faster than that would imply. This suggests that things like more efficient lighting and appliances are having an impact.

Separately, direct use of fossil fuels for things like furnaces, water heaters, etc., has been largely flat for the entire 30 years the EIA is looking at, although milder weather led to a slight decline in 2023 (8 percent for residential properties, 4 percent for commercial).

In contrast, the EIA only tracks the direct use of fossil fuels for industrial processes. These are down slightly over the 30-year period but have been fairly stable since the 2008 economic crisis, with no change in emissions between 2022 and 2023. As with the electric grid, the primary difference in this sector has been due to the growth of natural gas and the decline of coal.

Overall, there are two ways to look at this data. The first is that progress at limiting carbon emissions has been extremely limited and that there has been no progress at all in several sectors. The more optimistic view is that the technologies for decarbonizing the electric grid and improving building electrical usage are currently the most advanced, and the US has focused its decarbonization efforts where they’ll make the most difference.

From either perspective, it’s clear that the harder challenges are still coming, both in terms of accelerating decarbonization, and in terms of tackling sectors where decarbonization will be harder. The Biden administration has been working to put policies in place that should drive progress in this regard, but we probably won’t see much of their impact until early in the following decade.

Listing image by Yaorusheng

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OPEC members keep climate accords from acknowledging reality

carbon emissions, climate change, COP28, fossil fuels, paris agreement, Policy, Science, UN / /

Avoiding the truth —

COP28 agreement draft no longer includes calls to phase out fossil fuels.

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Image of a person standing in front of a doorway with

Enlarge / Saudi Arabia’s presence at COP28 has reportedly been used to limit progress on fossil fuel cutbacks.

Oil-producing countries are apparently succeeding in their attempts to eliminate language from an international climate agreement that calls for countries to phase out the use of fossil fuels. Draft forms of the agreement had included text that called upon the countries that are part of the Paris Agreement to work toward “an orderly and just phase out of fossil fuels.” Reports now indicate that this text has gone missing from the latest versions of the draft.

The agreement is being negotiated at the United Nations’ COP28 climate change conference, taking place in the United Arab Emirates. The COP, or Conference of the Parties, meetings are annual events that attempt to bring together UN members to discuss ways to deal with climate change. They were central to the negotiations that brought about the Paris Agreement, which calls for participants to develop plans that should bring the world to net-zero emissions by the middle of the century.

Initial plans submitted by countries would lower the world’s greenhouse gas emissions, but not by nearly enough to reach net zero. However, the agreement included mechanisms by which countries would continue to evaluate their progress and submit more stringent goals. So, additional COP meetings have included what’s termed a “stocktake” to evaluate where countries stand, and statements are issued to encourage and direct future actions.

The language of that statement needs to be agreed upon by every party and is invariably contentious. This year’s statement has been especially difficult, as early drafts (such as this one) included the potential to call for parties to stop using fossil fuels, along with a separate, vague alternative:

Option 1: An orderly and just phase out of fossil fuels;

Option 2: Accelerating efforts toward phasing out unabated fossil fuels and to rapidly reducing their use so as to achieve net zero CO2 in energy systems by or around mid-century;

Option 3: No text.

The “unabated” language in the alternative is widely interpreted as referring to abatement via the use of large-scale carbon capture to offset the emissions from continued fossil fuel use.

While we know that carbon capture can work, it has not been tried at large scales, much less on anything close to the scales needed to offset continued fossil fuel use. Critical details like the capacity and stability of different storage options haven’t been worked out, nor has the very tricky question of who will be paying to operate all the infrastructure that would be required for it to work.

As a result, carbon capture is not generally considered a viable option for offsetting anything more than a few difficult-to-decarbonize use cases, such as international shipping. Which why most countries and NGOs are supporting the UN’s secretary-general, who promoted the alternate language calling for a phase-out of fossil fuels.

Most, but not all. One notable NGO, OPEC, directly called on its members to reject any language that targeted fossil fuels. And a prominent OPEC member, Saudia Arabia, appears to have been trying to block any deals that would include that language, in part by bogging down all negotiations at COP28. Matters weren’t helped when a video surfaced that showed the conference’s host, Sultan Al Jaber, saying that there was “no science” behind calls to phase out fossil fuels, although he quickly disavowed that position.

The loss of Option 1 from the latest drafts is a sign that oil-producing nations have succeeded. Which in turn indicates that they have no intention of slowing production even as indications of continued warming and its consequences have grown ever more dramatic. It will also provide cover for many other countries that may be looking for excuses to act.

That said, the same draft includes several actions that do not have any alternative language and call for countries to take significant actions:

  • Triple renewable energy capacity by 2030.
  • Double the annual rate of energy efficiency improvements.
  • Immediately stop issuing permits for coal plants that do not include carbon capture and rapidly phase out any existing plants of this sort.
  • Rapidly phase in zero-emissions vehicles.
  • Eliminate fossil fuel subsidies.

Negotiations are ongoing, and that draft is nearly a week old, but it may indicate that some positive things could be accomplished while everyone is distracted by arguments over the phase-out of fossil fuels.

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