COP27 climate talks: what succeeded, what failed and what’s next

Abstract

atmosphere, in addition to the carbon dioxide. The gives the planet a similar composition to Saturn's, although it has no detectable rings.The team was also surprised to detect sulfur dioxide, which had appeared as a mysterious bump in early observation data. Its presence suggests that a photochemical reaction is taking place in the atmosphere as light from the star hits it, in a similar way to how the Sun produces ozone in Earth's atmosphere. In WASP-39b's case, light from its star, which is slightly smaller than the Sun, splits water in its atmosphere into hydrogen and hydroxide, which reacts with hydrogen sulfide to produce sulfur dioxide."These spectra are just exquisite in their detail, and reveal an additional way that the star affects the planet's atmospheric composition, through photochemistry," says Victoria Meadows, an astronomer at the University of Washington in Seattle."Photochemistry, because it is such an important process here on Earth, is probably an important process on other potentially habitable planets," says Jacob Bean, an astronomer at the University of Chicago in Illinois and the observation team's co-leader. Until now, "we've only been able to test our understanding of photochemistry in our Solar System. But planets around other stars give us access to completely different physical conditions.

A global just transition through carbon taxation and revenue recycling

“…Yet, we should remain optimistic. At COP27, countries achieved a historic new deal on creating a "loss and damage fund" to compensate vulnerable countries suffering from climate impacts 47 , which is seen as an important success for the global climate justice movement.…”

Techno-Economic Assessment of Large-Scale Green Hydrogen Logistics Using Ammonia As Hydrogen Carrier: Comparison to Liquified Hydrogen Distribution and In Situ Production

“…The last Climate Change Conference held in Sharm al-Sheikh, Egypt in November 2022, COP27, keeps this objective alive, but stronger efforts are needed. In accordance with the summary document of the event, limiting global warming to 1.5 °C above preindustrial levels requires “rapid, deep, and sustained reductions in greenhouse gas emissions” by 2030 …”

“…In accordance with the summary document of the event, limiting global warming to 1.5 °C above preindustrial levels requires "rapid, deep, and sustained reductions in greenhouse gas emissions" by 2030. 1 To cope with this situation, green hydrogen is seen as an essential tool, that is, hydrogen produced from water electrolysis using exclusively renewable electricity in accordance with the definitions stated by the International Renewable ENergy Agency (IRENA). 2 The main consequence of this process is the total absence of CO 2 production.…”

COP27: From preventing dangerous climate change to salving loss and damage

“…That is an invitation for continued debate and obfuscation even as many countries, not least China, are still increasing coal extraction and combustion. Delegates could not even agree whether natural gas should be classified as a "low-emissions" energy system [14]. Observers are increasingly acknowledging the failure of climate COPS and regretfully pointing to what may be the inevitable need for unproven technologies to sequester carbon and for potentially dangerous forms of global geoengineering [15].…”