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London. February 18, 2015. Spending on sustainability consulting engagements will grow from $877 million in 2015 to over $1 billion in 2019, according to a new forecast model produced by independent research firm Verdantix. Based on interviews with 260 heads of sustainability in 13 countries across 21 industries and financial data from 5,662 firms, the model forecasts growth in spending on sustainability consulting of just 4% per annum over the next five years.