Surpassing 1.5°C of warming can be undone at a later date – using tech, land and resources that don’t exist.

De facto, what they said was this: staying below a temperature limit is the same as first crossing it and then, a few decades hence, using methods of removing carbon from the atmosphere to dial temperatures back down again.

From some corners of the scientific literature came the assertion that this was nothing more than fantasy. A new study published in Nature has now confirmed this critique. It found that humanity’s ability to restore Earth’s temperature below 1.5°C of warming, after overshooting it, cannot be guaranteed. Many impacts of climate change are essentially irreversible. Those that are might take decades to undo, well beyond the relevant horizon for climate politics. For policy makers of the future, it matters little that temperatures might eventually fall back again; the impacts they will need to plan for are those of the overshoot period itself.

Brazil's Supreme Court is allowing Elon Musk's X to resume operations, apparently ending a months-long battle after the social network paid over $5 million in fines and reluctantly agreed to suspend accounts accused of spreading disinformation.

The court yesterday issued a press release announcing the reinstatement, saying that X has complied with all the orders it previously defied.

Chief Justice Roberts responded to the “momentous trio of Jan. 6-related cases…by deploying his authority to steer rulings that benefited Mr. Trump, according to a New York Times examination that uncovered extensive new information about the court’s decision making.”

In short, the Chief Justice used his powers to intervene and craft an opinion that some experts have said creates new law—certainly nothing that is found in the U.S. Constitution.

“There’s no legal authority for it,” remarked CNN legal analyst Norm Eisen back in December.

“The President of the United States is the most powerful person in the country, and possibly the world. When he uses his official powers in any way, under the majority’s reasoning, he now will be insulated from criminal prosecution. Orders the Navy’s Seal Team 6 to assassinate a political rival? Immune. Organizes a military dissenting coup to hold onto power? Immune. Takes a bribe in exchange for a pardon? Immune. Immune, immune, immune. Let the President violate the law, let him exploit the trappings of his office for personal gain, let him use his official power for evil ends. Because if he knew that he may one day face liability for breaking the law, he might not be as bold and fearless as we would like him to be. That is the majority’s message today.”