Vice/Motherboard: “Nitrogen is one of the most important elements for life on Earth: It’s the main component of the air we breathe, a key building block for proteins, and the magic ingredient in agricultural fertilizers that are essential to feeding the global human population.  But in recent decades, experts across a range of different disciplines have begun to flag a worrying decline of available nitrogen in ecosystems around the world. This trend is linked to human-caused climate change and could have “far-reaching consequences,” according to a new review summary published on Thursday in Science…”