I am writing about US President Barack Obama's plan to impose even steeper cuts on greenhouse gas emissions ("Obama hits power plants harder", August 3).
I believe the measures implemented by Obama will switch the emphasis to renewable energy sources such as wind and solar power.
In presenting his strategy, Obama said he was convinced by the threat faced by the planet. He singled out coal-burning power plants for blame, as they provide so much of the country's electricity supply.
Under his clean power plan, there will be a 32 per cent nationwide cut in carbon dioxide emissions by 2030 compared with 2005 levels.
Many people have condemned the plan. Republican presidential candidates were heavily critical, using words such as "catastrophic" and "irresponsible".
However, I believe it is an effective way to reduce greenhouse gases.