The country is optimistic about meeting its energy and environment goals for 2015, the top economic planner said on Thursday as officials shed light on efforts to slash green house gas emissions.

Energy consumption per unit of GDP was cut by 5.6 percent in the first quarter compared with the same period last year, suggesting that the full-year target of 3.1 percent should be easily with in reach.

"We are relatively optimistic about fulfilling the full year's target," Zhang Yong, vice-chairman of the National Development and Reform Commission, said on Thursday.