If farmers could supplement their feed with seaweed, this could help with two of the biggest challenges of our time: fighting climate change and growing more food with fewer resources. CSIRO and James Cook University are currently conducting further experiments to examine how feeding seaweed to cattle affects production. These experiments aim to confirm the effects measured in the lab and could create a new industry in growing seaweed as a feed supplement for livestock. https://blog.csiro.au/seaweed-hold-key-cutting-methane-emissions-cow-burps/

Seaweeds can grow very fast at rates more than 30 times those of land-based plants. Because they de-acidify seawater, making it easier for anything with a shell to grow, they are also the key to shellfish production. And by drawing CO2 out of the ocean waters (thereby allowing the oceans to absorb more CO2 from the atmosphere) they help fight climate change. https://theconversation.com/how-farming-giant-seaweed-can-feed-fish-and-fix-the-climate-81761

Atmospheric readings from Cape Grim, Tasmania along with two stations in Hawaii and Alaska, are closely watched as they date back decades and closely track a range of pollutants from ozone-depleting chemicals to the various greenhouse gases resulting from burning fossil fuels and clearing forests. Sites in the northern hemisphere exceeded CO2 400 ppm from 2012 onwards. But as the region has greater seasonal variation, mostly because there is more terrestrial vegetation, CO2 concentrations dropped back below that mark each spring. Now Cape Grim, which offers some of the purest air in the world for measuring climate change, has passed CO2 400 ppm, and it will need a huge global effort to curb greenhouse gas emissions to push the level back down.

Within the next couple of weeks a major climate change marker is likely to be passed in a remote part of north-western Tasmania called Cape Grim. It's the co2 monitoring site jointly run by CSIRO and the Bureau of Meteorology and researchers predict its baseline reading of 400 ppm (parts per million) of carbon dioxide in the atmosphere is likely to be exceeded. Cape Grim's readings are significant because they capture the most accurate reading of atmospheric conditions in the southern hemisphere and have records going back 40 years. While the fraction may seem small, it's 0.04% of the atmosphere and it's symbolic. By comparison, a similar level of alcohol is near the legal driving limit of less than 0.5% in Australia.