carbon

Critics say it allows multiple actors to count the same carbon emissions.

An NV center consists of a nitrogen atom replacing a carbon atom and an adjacent vacancy where a carbon atom is missing.

Elements are defined by the number of protons in their nucleus—all oxygen atoms have eight, and if an atom has six protons, it’s carbon—but the number of neutrons can vary.

Meanwhile, fertiliser use emits nitrous oxide -- the third-most-potent greenhouse gas after methane and carbon dioxide.

Last month, the International Maritime Organization, the world shipping body, set about to put in place the first ever global carbon tax under which shippers would be held accountable for their emissions.