A fully active carbon cycle acts as a thermostat, regulating a planet's climate. (phys.lsu.edu)
The oceans are the largest active carbon sink on the planet, covering more than 70 per cent of its surface area, and are predicted to grow as sea levels rise. (scidev.net)
The automatic air conditioning comes with a high - yield active carbon filter that captures particles and efficiently purifies the air to protect passengers from external pollution. (netcarshow.com)