Letters | We should be fighting climate change instead of each other
- Readers discuss how Bhutan offers a good lesson in energy sufficiency and national happiness, and suggest ways to help Hongkongers opt out of circular mail

To display a nation’s power by boosting its military strength involves an endless chase and a huge financial burden, neither of which is welcomed by humankind.
The world’s militaries are responsible for about 6 per cent of global greenhouse gas emissions, according to Scientists for Global Responsibility.
Today, most of humanity seeks harmony and sustainable economic prosperity, not war. Instead of increasing military spending year after year, channelling such huge resources into supporting the development of robust healthcare systems, better social security and genuine green products would benefit all.
Developments that meet these goals will help the global economy recover. Nations owning genuinely green technologies will earn local and foreign investments, making them fiscally robust. This in turn will help them become truly powerful without hurting human populations or the environment.