Here are the climate-related sections of speeches by MPs during the Commons debate Northern Ireland Office.
19:11 Sammy Wilson (DUP)
Other actions have been taken by the Government that have made the routes more difficult, including the imposition of the carbon tax on shipping. That will be implemented from 1 July, and it is estimated to increase the cost of bringing goods across the Irish sea from GB to Northern Ireland, or vice versa, by around 7%. That, again, makes the route and the bringing of goods in from GB less competitive, on top of all the other reasons why companies do not want to sell to Northern Ireland now anyway—namely, the additional paperwork.
[Source]