Reuter's Carey Gillam takes note of the growing interest among impact investors in sustainable agriculture investment opportunities, particularly in Africa.

"Investors eyeing agriculture in Africa, Latin America and other global markets are increasingly merging their pursuit of profits with a philanthropic zeal that promoters say will pay benefits over the long term.

"So-called 'impact investing' is catching on with a range of private equity groups, financial services firms, venture capital funds and other moneyed players."