The Environmental Protection Agency has said Ireland is on course to exceed its annual Greenhouse Gas Emissions limit for 2016.
A report by the EPA shows that emission levels have been going up since 2014, in line with increased economic activity.
In its preliminary report for 2015, the EPA estimates that there was a 3.7% increase in carbon dioxide emissions from 2014.
The Agency has warned the Government that Ireland has not yet achieved a decoupling of economic growth from emissions.
The transport, farming and energy sectors account for almost 73% of the country's greenhouse gas emissions, the report found. Agriculture is the single biggest contributor, at 33% of the total.
Transport contributes 19.8% and energy 19.7%.
EPA Director General Laura Burke said: "Ireland is not currently on the right track to meet its 2020 targets, nor is it on the right emissions trajectory to meet future EU targets or our national 2050 decarbonisation goals."