In the past many scientists and economists presumed we were purely rational beings, self-promoting our own interests with perfect knowledge of the consequences of our actions. These assumptions are really influential: many world governments rely on our self-interest and perfect decision-making to change our behaviour, hoping rational arguments and penny-savings will alter our trajectory towards crisis.
Why is democracy the secret for sustainability? Two reasons: 1) it allows the majority of good sensible people to stop the unsustainable ones; 2) its makes sure that people feel they have the ability to make change, because without the ability to make change people see being sustainable as futile and give up - paradoxically ensuring what they hoped to avoid!
Only certain types of fish, including mackeral and tuna, have dangerous levels of mercury and only if you eat them nearly every day. Though the Atlantic Mackeral caught here in Cornwall, contain a lot less Mercury than the Spanish Mackeral eaten elsewhere and are very safe and healthy to eat.