4GB are more than enough. The only game which used all my 2Gb was Crysis during few minutes (normally 1.5/1.8Gb), and Photoshop working on a very big image needs a lot more than 2Gb.
I would buy 4Gb, if you need more, you always can buy more
We should do this once a week or once a month, but everybody by its own, when we want and not because somebody says to do it. We would save more energy and with less risk. Massive blackouts are dangerous
Do you know what could happen if when the blackout ends, millions of people restart their energy again simultaneously? That´s the worse idea for saving the world :bananadea