Only spend money if you have it - that has kept me safe so far

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Dr Tara Shine is an environmental scientist, broadcaster and co-founder of Change by Degrees, which promotes convenient sustainability for communities and businesses. Her new book, How to Save Your Planet One Object at a Time, is out now.

What’s the most important lesson about money your career as a scientist, author, social entrepreneur, adviser and broadcaster has taught you?

That there are far more important things in the world than money, and that real value and happiness cannot be measured in monetary terms.