We found the following books and articles very helpful in understanding what a diet could look like that is enjoyable for us now and still good for our grandchildren in the future:
>carrots recommends Sapiens by Yuval Noah Harari

Yuval Noah Harari

The Story of Human Evolution and what made us into who we are today

What is it good for: Putting our actions and diet into a bigger context – as in 100,000 years big

In the kit
>carrots recommends Part-Time Vegetarian by Nicola Graimes

Nicola Graimes

Flexible Recipes to go (nearly) Meat-Free.

What is it good for: Hands on ideas and advice for making great veg food

>carrots recommends Modern British Cooking by Jesse Dunford Wood

Jesse Dunford Wood

The ultimate fun cookery book, great to give and great to receive.

What is it good for: Making you smile and making you hungry.

>carrots recommends How bad are bananas by Mike Berners-Lee

Mike Berners-Lee

The Carbon Footprint of Everything

What is it good for: Understanding the impact of your meals on global warming - in the most fun way

>carrots recommends Meat Hooked by Marta Zaraska

Marta Zaraska

The History and Science of Our 2.5-Million-Year Obsession with Meat

What is it good for: Learning about our cultural, biological and emotional connection to meat

>carrots recommends Omnivores Dilemma by Michael Pollan

Michael Pollan

A Natural History of Four Meals

What is it good for: Learning where exactly most of our food comes from

>carrots recommends Waste by Tristram Stuart

Tristram Stuart

Should Be Self-Explanatory :)

What is it good for: Identifying the flaws in our current food systems

>carrots recommends The Ethical Carnivore by Louise Gray

Louise Gray

The story of Louise, who decided to only eat animals she killed for one year

What is it good for: Exploring our attitudes towards eating meat and what it takes to be comfortable with it

>carrots recommends a Sustainable Diet by WRI

World Resources Institute

Explores a Sustainable Diet in Charts

What is it good for: Understanding how we can sustainably feed the human population going forward