Glen Peters, Discover and Read the Best of Twitter Threads by @Peters_Glen

Glen Peters

Peters_Glen

EU27+UK GHG emissions (including LULUCF) have declined 30% from 1990 to 2019.By changes by sector were:* Energy: -28%* Industry: -30%* Agriculture: -20%* Waste: -44%* LULUCF: +37% (stronger sink)1/ The energy

Cumulative CO₂ emissions explain most future global warming, assuming sufficient action on non-CO₂.Distributing a remaining carbon budget of 500GtCO₂ with a linear decline (black) leads to net-zero ~2045.Depending on short-term

"Human-caused climate warming stops when humans stop adding CO₂ to the atmosphere, & emissions of other greenhouse gases are declining sufficiently" (text from @KA_Nicholas)A THREAD on a recent presentation on

on alternatives to "net-zero""CO₂-induced global warming stops when anthropogenic CO₂ emissions balance with anthopogenic CO₂ removals"is a long version of "CO₂-induced global warming stops with (net-)zero C

1. We have heard the mantra that net-zero CO₂ is needed to get stable temperatures, but nearly all mitigation scenarios have negative net emissions. Why?This means that the temperature declines

THREAD: The @IEA now has an aggressive 1.5°C scenario, reaching net-zero by 2050.It builds on the Sustainable Development Scenario, strengthening reductions in power & end-use, but with new behavioural measures.The

THREAD: N₂OWe have a new paper in @nature on nitrous oxide (N₂O), five years in the making!Like many GHGs, N₂O concentrations have been stable for thousands of years, but that

THREAD: What is the latest in climate?Concentrations of CO₂, CH₄, & N₂O continued to increase in 2019 & 2020, reaching 150%, 260%, & 120% above pre-industrial. https://public.wmo.int/en/resources/united_in_science 2. Preli

THREAD (without figures)Four principles for thinking about CO₂ removal:1. Don't forget the long game2. It's not all about CO₂3. Split, don't lump4. Don't bet it all on being righthttps://www.sciencedirect.com/science/art

1. Do Integrated Assessment Models (IAMs) show similar pathways to below 1.5°C?Robust: All have less fossils, more non-fossils.Details (a thread): The range of primary energy in 2100 is from 300EJ

Do scenarios adequately explore uncertainty in land-use change emissions?CO₂ emissions from LUC vary little across scenarios, with baselines (grey) & mitigation scenarios having large overlaps.Historical datasets highly uncertainty (l

The IMF has updated its GDP projections to a 4.9% decline in 2020. They have a "faster recovery" scenario with a 4.4% decline.@clequere et al (https://rdcu.be/b4lg7 ) estimated a 4-7% reduction