Oil and gas

The US government has invested about 60 billion in renewable energy experiments and we have little to show for it. There are 700,000 semi’s on the road and it cost about $20,000 to convert a truck from diesel to natural gas and that comes to 14 billion. In addition there are 10,000 truck stops and it would take about $500,000 to get them setup to sell natural gas and that cost another 5 billion. By doing this we would use 500 million barrels of oil less each year and that is what we import from Saudi Arabia. The cost savings to each truck owner would be about $20,000 per year and CO2 emissions would be 70% less. In addition other contaminants like oxides of sulfur and nitrogen are almost eliminated. Is our government investing in the wrong area?