Chief executive Sean Coyle has two problems. One is the weather. The other is poor access to suitable capital via the Dublin and London stock exchanges, where his international agricultural and landscaping inputs and services group, Origin Enterprises PLC, is listed. Neither is specific to Origin, but when the shrinking pool of stock investors active in its two key markets meets the rising risks associated with supplying farmers in the face of climate change, the resulting environment for the business’s valuation is far from ideal. Coyle is calm and confident when he talks about the evolution of Origin towards a…