Face masks like these, modeled by students from the Peltier Aerosol Lab, vary widely in effectiveness against fine particle pollution.
Richard E. Peltier
Inexpensive cloth face masks, worn by many people in heavily polluted countries, offer only partial protection. Instead governments should warn people to avoid exposure and work to clear the air.
Time to take a different road?
The world's use of finite resources continues to rise as global development continues. Can we help poorer nations raise their standard of living without exhausting all of our raw materials?
Community activities in Kampala, Uganda, organised by SASA!
Many women across the world feel unable to refuse sex or request condom use. Empowering them could help bring down HIV rates.
Many of the Orang Ulu people of Sarawak make money from handicrafts or food they have grown on their padi farms.
Zainal Abd Halim/Reuters
Many developing economies have already embraced the sharing economy, now they have a platform to get more out of it.
The silverlead whitefly is a major agricultural pest.
Invasive species and diseases pose a major threat to agriculture – particularly in the countries that can least afford it.
Coal is a relatively cheap, abundant and well-established source of energy.
Millions of people live without access to electricity. Now it's a battle between coal and renewables to bring cheap power.
A woman in Burkina Faso collects firewood. Developing nations – and particularly women in these nations – are more vulnerable to climate change, and have less ability to adapt.
Climate justice is becoming an increasingly important part of climate action.
The earth is a finite place.
Earth image from www.shutterstock.com
The global economy is already unsustainable – let alone if it gets bigger.
Major development banks are funding logging, mining and infrastructure projects that are having enormous impacts on nature. Here, forests are being razed along a newly constructed road in central Amazonia.
Big new investors such as the Asian Infrastructure Development Bank are key players in a worldwide infrastructure, and that could be bad news for the environment.
So much water has gone into groundwater it has slowed rising seas.
Bore image from www.shutterstock.com
There's enough water under the ground to form a lake 100m deep over the earth.
Even something as simple as a water pump might not work if it requires parts or power not readily available where it’s installed.
Much international aid fails to achieve its ends because the technology employed is not "appropriate" to its intended environment or culture. This needs to change.
Countries such as Mauritania have contributed little to climate change, yet face the worst impacts such as crop failure.
The countries that have contributed the least to climate change will experience the worst of its effects.
Free Basics is only some people’s idea of ‘equality’.
Free Basics may be free to the user, but it'll cost India's economy in the long run.
Severe floods in Chennai. How should developing countries hold richer countries to financial commitments to adapt to climate change?
How to ensure rich countries will live up to their promises of money and carbon emissions cuts? Developing countries need to look to the Allies' unified strategy in World War II.
Saleemul Huq (left) says the world’s vision should be to help everyone with climate change - even the very poorest.
A majority of countries want visionary action rather than pragmatism at the Paris climate talks, says the International Institute for Environment and Development's Saleemul Huq.
Developing countries can expect much better outcomes from the Paris climate change talks compared with Copenhagen six years ago.
African countries stand a good chance at COP21 of getting their ideas across. There will also be a better opportunity for these countries to access climate finance.
Cotton on the move in Burkina Faso.
The GM debate in the developing world encompasses countries with very different priorities. Through the shrill battle of interests, the real agents for change tend to be overlooked.
Evacuees gather at a rescue centre after this month’s floods in the Philippines. But for many women the danger doesn’t end here.
EPA/Francis R. Malasig/AAP
Climate change isn't gender-neutral. The effects are likely to hit the world's poorest women hardest of all, because they are more likely to lack the resources to escape natural disasters or disease.
New Delhi’s Yamuna River, like much of India’s water, is polluted. The world urgently needs low-carbon ways to clean things up.
Much of the world still lacks access to proper sanitation and clean water - an issue that needs urgent action. But without low-carbon technologies, clean water could come at the expense of the climate.
Access to the grid has crowded out solar in some places in India.
DFID - UK Department for International Development/Flickr
Given existing technologies, expanding access to electricity almost always increases CO2 emissions. There are real trade-offs between addressing poverty and climate change.