Give eating fish a miss or eat less. Be picky about sustainability (mcsuk.org has a useful ‘good fish’ guide) and whether your food is the product of slavery at sea. Eating more meat won’t help fish stocks – at least a fifth of fish feeds industrial farm animals like pigs and chicken. Farmed fish also uses fishmeal and chemicals, but some fish farming ranks high in terms of sustainability.

Avoid goods wrapped in plastic wherever possible. Urge stores to stock non-plastic options and governments to legislate against plastic waste.