The linked article on the World Bank Group website is by Dimitris Tsitsiragos is Vice President of Global Client Services at IFC, a member of the World Bank Group. The article is intended to encourage the private sector to take action and is a follow-on to the Paris Agreement and I believe that the cited climate consequences represent a lower bound of what may come.
http://www.worldbank.org/en/news/opinion/2016/01/13/climate-change-is-a-threat---and-an-opportunity---for-the-private-sectorExtract: "No matter what kind of agreement follows after Paris, the fight against climate change will not be cheap. Developing countries will need about $100 billion of new investments per year over the next 40 years to build resilience to the effects of climate change. Mitigation costs are expected to be in the range of $140–$175 billion per year by 2030. This enormous burden cannot be carried out by national governments, many of which are already struggling to make ends meet: they will need the buy-in and participation of the private sector.
But why should businesses, whose main responsibility is to their shareholders, care about climate change?
The answer is simple. A growing number of studies are showing that it could be disastrous for the bottom lines of companies around the world. If global temperatures jump four degrees by 2100 – the path we're on now – they could spark droughts, flooding and ferocious storms, sowing financial chaos and upending small shops and international conglomerates alike.
A study by CitiGroup found that rampant warming could shave up to $72 trillion off the world's gross domestic product, while another report in the journal Nature found it could reduce average global incomes by nearly a quarter. A four-degree Celsius jump would also batter sectors like agriculture, real estate, timber, and emerging market equities. All told, that would make for a toxic environment for businesses large and small.
Investors wouldn't be immune either. A report by Cambridge University suggests equity portfolios could tumble by up to 45 percent as climate-related fears ripple across global markets."