A group of global investors is urging the European Commission not to consider industrial farming an activity that is good for the environment.Reuters reported the request last week.It said the international group of companies that wrote the letter to the commission is together worth more than $3.5 trillion.The European Commission is close to defining what activities the European Union considers sustainable.The EU hopes the move will get businesses to help it lower emissions of carbon gases linked to climate change, also called greenhouse gases.It has been difficult, however, to reach political agreement on what activities to include in the EU taxonomy.Taxonomy is a word describing to a process of placing things in groups based on their qualities.Farming is responsible for around 10 percent of the EU's carbon gas emissions.But how to deal with farming in EU rules has been a disputed issue because the industry is so important and employs many people.Countries and trade groups also have an interest in continued government support for the nuclear energy, gas and farming industries.