The year 2023 is officially the warmest on record—overtaking 2016, the previous warmest year, by an alarming margin. According to the latest data from the European Union's Copernicus Climate Change Service, released Jan. 9, Earth was 1.48 degrees Celsius (2.66 Fahrenheit) hotter last year compared with pre-industrial levels—dangerously close to the 1.5-degree threshold set by the Paris climate deal. 2023 also marked the first year in which each day was over one degree warmer than the pre-industrial average. Temperatures over 2023 likely exceeded those of any year over the past 100,000 years, the report found. This was partially due to the year's El Niño climate phenomenon, but those impacts only began in June—and every subsequent month last year was the warmest on record for that particular month. September represented the largest climatological departure since record-keeping began over 170 years ago.

Globally, there have been resounding calls for a long-term ceasefire to bring an end to more than two months of bloodshed and a spiralling humanitarian catastrophe in the Gaza Strip. Nearly 19,000 people have now been killed by Israel's bombardment and ground invasion, according to the health ministry in the enclave, and over 80% of the 2.3 million people who live in Gaza have been displaced from their homes. While the United States has continued to support Israel's war effort (including through weapons sales), cracks have emerged as Israel has apparently paid little heed to US calls to try to limit civilian casualties and allow more access for humanitarian aid. Israel has said its fighting against Hamas could last months. With aid agencies already struggling to operate, the impact of a prolonged war on a population squeezed into a sliver of southern Gaza—and suffering from food shortages and outbreaks of disease—is hard to imagine.

In what is being hailed as an historic decision, on Nov. 24, an appeals court in Ecuador ordered the return of a 42,360-hectare expanse of the Amazon rainforest to the Siekopai indigenous people, generations after they were driven from the territory by the military. The Provincial Court of Sucumbios ruled that the Siekopai (also known as Secoya) retain indigenous title to their ancestral homeland, known as Pë’këya, which lies along the border with Peru in remote country.

Mexico will step up efforts to deport asylum-seekers and migrants to their countries of origin in order to "depressurize" northern cities bordering the United States, the country's National Migration Institute announced Sept. 22 following a meeting with US officials. The number of people crossing the US-Mexico border has spiked again in recent weeks after a lull that followed the end of pandemic-era asylum restrictions and the introduction of new deterrence policies in May. It is unclear when the deportations will begin because Mexico will first have to negotiate with Venezuela, Brazil, Nicaragua, Colombia, and Cuba to make sure they accept their nationals. US cities, such as El Paso and Eagle Pass in Texas, have been scrambling to find shelter space as thousands of people have crossed the border on a daily basis in recent weeks, overwhelming reception capacity. Thousands are also still choosing to wait in northern Mexico while trying to make appointments using a government cell phone application to enter the United States and lodge asylum claims.

President Joe Biden is temporarily deploying 1,500 soldiers to the US-Mexico border ahead of the end of a pandemic-era entry restriction known as Title 42 on May 11. The soldiers are to perform administrative tasks, but critics say the move sends the message that migration is a threat. Tens of thousands of asylum seekers and migrants currently stranded in dire conditions in northern Mexican border cities by US policies are growing increasingly desperate and frustrated. More than 15,000 people—mostly from Venezuela—crossed the border in the vicinity of Brownsville late last month, overwhelming shelter capacity. And in El Paso, nearly 2,000 people who recently crossed the border are sleeping on sidewalks in the city center. The Biden administration has introduced a number of policies aimed at extending asylum restrictions at the border and curbing migration. The administration reached a deal with Mexico on May 2 that for the first time allows the US to deport non-Mexicans who enter the country irregularly back across the border.

Brazil's government declared a public health emergency on Jan. 20 for the Yanomami indigenous people, now plagued by rising death rates from malnutrition and curable diseases such as malaria, flu and diarrhoea. President Luiz Inácio "Lula" da Silva flew to the remote Yanomami territory in Roraima state after horrifying photographs emerged of emaciated Yanomami children and adults. The trip coincided with an an emergency airlift of 16 starving Yanomami to receive urgent treatment. After his visit, Lula tweeted: "More than a humanitarian crisis, what I saw in Roraima was genocide: a premeditated crime against the Yanomami, committed by a government insensitive to suffering."

New York Mayor Eric Adams on Jan. 15 traveled to the US-Mexico border and declared that "there is no room" for migrants in his city. At a press conference with El Paso Mayor Oscar Leeser, Adams called on the US government to help cities manage unprecedented levels of immigration, and claimed that the influx of migrants could cost New York City up to $2 billion. "The federal government should pick up the entire cost," Adams said. "[W]e need a real leadership moment from FEMA. This is a national crisis." He also criticized the governors of Texas and Colorado for contributing to a "humanitarian crisis that was created by man," citing busloads of migrants sent to New York and other northern cities.

President Joe Biden on Jan. 5 announced that the US is to extend a parole program previously offered only to migrants from Venezuela to those from Cuba, Nicaragua and Haiti, allowing them to apply for residency—but reiterated that his administration will continue to enforce Title 42, in compliance with a recent order from the Supreme Court. In fact, under his new policy, Title 42 expulsions are to increase, with Mexico agreeing to accept expelled Cubans, Nicaraguans and Haitians. A provision of the Public Health Service Act allowing for summary expulsion of migrants at the southern border, Title 42 has been in effect pursuant to a Centers for Disease Control order of March 2020 as a COVID-19 emergency measure.