Environmentalism gone too far - bread

This is just nuts - from The Beeb:

Bread's environmental costs are counted
The environmental impact of producing a loaf of bread has been analysed in depth from the farm to the shop shelf.

The biggest single factor is the use of fertiliser to grow wheat, which accounts for 43% of greenhouse gas emissions, say experts.

Emissions arise from energy needed to make ammonium nitrate fertiliser and from nitrous oxide released when it is broken down in the soil.

Around 12 million loaves are sold each day in the UK.

Consumers need to be more aware of the environmental costs of their food, say researchers at the University of Sheffield.

A bit more:

Lead researcher Dr Liam Goucher said that in every loaf there is embodied global warming resulting from the fertiliser farmers use to increase their wheat harvest.

I think that Dr. Goucher has too much time and money on his hands if he is fooling around with tripe like this. Maybe he would be ripe for a budget cut - after all, running the lights and heading in his lab probably outputs a lot of CO2 as well - what is his lab's carbon footprint? But wait, there's more:

Prof Peter Horton, a co-researcher on the study, added: "With over 100 million tonnes of fertiliser used globally each year to support agricultural production this is a massive problem, but environmental impact is not costed within the system and so there are currently no real incentives to reduce our reliance on fertiliser."

What a maroon - your proposal is for people to starve? Also, it is a well documented fact that crop yields per acre have increased 4% to 7% from 1980 to 2006 solely due to the increase in atmospheric Carbon Dioxide. From Nature: How much has the increase in atmospheric CO2 directly affected past soybean production?, from The National Academies Press: Effects of Increasing Carbon Dioxide Levels and Climate Change on Plant Growth, Evapotranspiration, and Water Resources 

Something that people fail to grasp is that CO2 is plant food - without it, there would be no photosynthesis and therefore, no plant life.