The sixth mass extinction, primarily driven by human activities, is more dire than previously anticipated, with entire branches on the tree of life now disappearing, finds a new study published in the Proceedings of the National Academy of Sciences Sept. 18. Researchers from Stanford University and the National Autonomous University of Mexico, led by Gerardo Ceballos and Paul Ehrlich, assessed 5,400 genera of terrestrial vertebrates, including 34,600 species. The staggering results: 73 genera have become extinct since 1500 AD. This rate of extinction surpasses the last million years by 35 times. In other words, in just five centuries, human actions have triggered a surge of genus extinctions that would have otherwise taken 18,000 years. The researchers refer to this as a "biological annihilation." (Earth.com)

Brazil's Supreme Federal Tribunal on Sept. 21 struck down the spurious thesis behind a legislative proposal advancing in the country's Congress, which would impose a marco temporal or "time limit" on indigenous land recovery claims. The marco temporal law would nullify any indigenous group's claim to traditional lands that they weren't physically occupying on Oct. 5, 1988, the day of the enactment of Brazil's Constitution, which for the first time recognized native peoples' territorial rights. Instead, these lands would be considered the property of those currently in occupancy, or of the state. The thesis ignores the forced displacements that occurred during Brazil's dictatorship in the generation before 1988, as well as the nomadic lifeways of some indigenous groups. Environment Minister Marina Silva declared the high court's annulment of the marco temporal thesis an "act of justice."

Colombia recorded the world's highest number of killings of environmental defenders in 2022, with 60 individuals murdered, according to a report released on Sept. 12 by activist group Global Witness. The organization, which has been documenting environmental defender deaths since 2012, found that the number of environmental defenders slain in Colombia nearly doubled in 2022, compared to the previous year. These killings have pushed Colombia's environmental defender death toll to 382 since 2012.

A Buddhist monastery carved out of a cave complex in the rainforest of Malaysia stands to be evicted after losing a legal appeal in its case against a cement manufacturer that seeks to demolish it to mine limestone Sept. 8. The Court of Appeal ruled for Associated Pan Malaysia Cement in the case brought by the century-old Dhamma Sakyamuni Caves Monastery, finding that the company has the right to evict "squatters" from the tract at issue on a limestone massif known as Gunung Kanthan—despite the fact that it lies within the Kinta Valley National Geopark. The forested massif is home to several endangered species of both flora and fauna, and most of it has already been cleared for quarries. After the appeals court ruling, the Perak state government formed a special committee to mediate in the conflict. The Dhamma Sakyamuni monks pledge they will resist eviction. (The Star, New Straits Times, NST, Free Malaysia Today)

Amnesty International on Sept. 13 joined with over 200 civil society organizations to call upon participating governments of the 28th Conference of the Parties (COP28) to address the human rights record and climate policies of the United Arab Emirates. The COP, the annual summit of governments from around the world to discuss climate policy, is to be held in the UAE in December—convened by Sultan al-Jaber, CEO of the Abu Dhabi National Oil Company (ADNOC).

The death toll from catastrophic flooding in northeast Libya continues to climb, with reported numbers now ranging as high as 11,300—and thousands still unaccounted for. People across Libya have stepped up to help, sending convoys of aid across the politically divided country and opening their homes to strangers. Meanwhile, anger is spreading about why two dams in the port city of Derna—which collapsed under the weight of flooding, leading to the destruction of entire neighborhoods—were allowed to decay. There have also been accusations that authorities ignored warnings about the severity of the storm, contributing to the massive death toll. 

The inaugural biennial Africa Climate Summit, which was attended by some 30,000 delegates including 17 heads of state, wrapped up in the Kenyan capital, Nairobi, Sept. 6 following three days of discussions largely centred on the opportunities for "green" economic growth on the continent. The summit issued the Nairobi Declaration, containing a slew of pledges and demands, including calls to accurately value the continent's natural carbon sequestration assets (such as its forests), and for $600 billion in investment in renewable energy (a more than 435% increase) to produce at least 300 gigawatts by 2030. The declaration also called on wealthy countries to live up to their existing commitments to cut emissions and to deliver funds for adaptation—by properly launching, for example, the Loss & Damage Fund agreed to at last year's COP27 in Egypt. However, the summit was also dogged by controversy and protests, with more than 500 civil society organizations signing an open letter claiming its agenda had been hijacked to market "false solutions" such as carbon markets.

After a snap election in Ecuador Aug. 21, left-populist Luisa González and millennial businessman Daniel Noboa are headed to a runoff in October. Both are seen as political successors: Frontrunner González is a protegé of exiled former president Rafael Correa. Second-placing Noboa is the son of banana magnate and five-time conservative presidential candidate Alvaro Noboa. Placing third was Christian Zurita—whose name was not on the ballot, but who replaced the assassinated anti-corruption candidate Fernando Villavicencio. (PRI, NPR, Al Jazeera)