One of the areas that I think has always been massively overlooked is in the petroleum industry, the gas flaring that goes on continuously in many of the industrializing countries. I still remember flying once from Amsterdam to Japan and it was in the middle of the night, two in the morning, and the entire sky was emblazoned like it was sunlight in Siberia because of all the flaring that was going on.
The natural gas leakage that goes on throughout eastern Europe is massive. When you're looking to try to reduce natural gas leakage in Alberta by thousandths or hundredths of 1% versus the 5% to 10% leakage that's going on in some of the countries, it just makes so much more common sense.
CCS, carbon capture and storage, is another area. It has had its issues in terms of implementation over the years.