Your letters.

This document is a collection of letters from readers published in New Scientist. The letters cover a range of topics, including the search for advanced alien life, the potential of regenerative agriculture to combat climate change, alternative sources of omega-3 for vegetarians and vegans, the challenges of addressing eco-anxiety, the complexity of the economy, the nature of dark matter, the impact of vines on buildings, the risks of technological optimism, the concept of living in a simulation, and the philosophical implications of the quantum multiverse. The letters provide diverse perspectives on these subjects and offer insights into current scientific debates. [Extracted from the article]