Carbon productivity is a measure of how much value is generated from the consumption of energy. We are working to improve our carbon productivity through several mechanisms, including: improving the energy efficiency of our production processes and product distribution; increasing our use of renewable energy; pursuing opportunities to further deploy our carbon capture technology and expertise; and enabling our customers and their downstream users to avoid CO₂ emissions. Below are carbon productivity improvements for 2019 (compared to 2015 baseline).
Our direct (Scope 1) and indirect (Scope 2) CO₂ emissions are related to the energy we consume. In 2019, our Scope 1 GHG emissions, which are primarily from our HyCO operations were 16.6 million MT, representing a 1% increase from the prior year. Our Scope 2 emissions, which are due in large part to the electricity and steam we consume in our ASUs, were 10.6 million MT in 2019, which was a 4% increase from 2018. On an intensity basis, our Scope 1 and 2 emissions improved by 2.3% due to energy efficiency improvements and we met our GHG emissions intensity goal for 2020. Our Scope 3 emissions were 6.6 million MT.
As in prior years, CO₂ emissions data was externally verified by WSP, a management and consultancy service provider.
We have made several investments over the past several years to improve fleet efficiency, reducing fuel consumption and CO₂ emissions. This included replacing 30% of our North American tractors, 65% of our fleet in the UK with fuel efficient Euro 6 compliant tractors and replacing additional tractors in Belgium, France and the Netherlands. Upgrades also included higher payloads on some vehicles that increased tons of product shipped per distance driven and fuel efficiency. We have met our distribution efficiency goal.