Prime Minister Narendra Modi on Monday inaugurated the Kochi-Mangaluru natural gas pipeline, via video conferencing; saying the project will help reduce pollution.The total cost of the project was about Rs 3,000 crore and its construction created over 12 lakh man-days of employment, news agency PTI reported."It is an honour to dedicate the 450-km pipeline to the nation. This is an important day for India, especially for people of Karnataka and Kerala," PM Modi said.