Holiday Gift Guide 2018: Educational and environmental toys can be a lot of fun

Trying to buy ‘green’ toys is tricky for a lot of people. Should it mean toys made of sustainably harvested materials, free of paint and preservatives? (Sometimes purchasers are worried about them being the bran of the toy world — good for you, but not particularly enjoyable for everyone.)
Should they be toys and books that encourage children to think about the world around them, and how they use resources? How do they engage curiosity about the environment, and perhaps subtly