This link will take you to a number of great reviews and suggestions to shore up any multicultural collection. Jump into a Book is a great resource for all things multicultural and it also delves into environmental issues.
The sight can be a bit haphazard to navigate, so take the time to look around; there are a number of really useful resources and suggestions to add to your arsenal. Check out the Book Play and Read sections as they offer book reviews and do-able activities to tie in with the reading and add some zip! Their Monday blog post, Weekend Links, looks at a variety of subjects: thematic information, book reviews, awards and events.