Some scientists have started exploring geo-engineering to combat climate change, such as adding iron powder to the oceans to dramatically increase absorption of CO2 on a planetary scale and using devices to suck CO2 from the air. Massive seawater agriculture along 24,000 kilometers of coast deserts would be a carbon sink and a source for biofuels, paper products, and food. Laboratory breakthroughs in solar energy promise to cut costs drastically, yet 800–1,000 coal plants are planned with 40-year life spans. Carbon trading, including buying carbon offsets, is gaining attention. Carbon capture and storage would help reduce emissions, but even if emissions can be stabilized, heat generated by energy consumption could further the warming.
Environmental security, not just climate change, should be brought to the UN Security Council. Massive urbanization and concentrated livestock production could trigger new global pandemics. Climate change alters insect and disease patterns. Definitions and measurements will be needed for commonly applied tax incentives, along with labels for more environmentally friendly products and green accounting. Developing countries need to leapfrog unsustainable practices to more sustainable ones; the World Bank estimates that adapting to climate change will cost developing countries $10–40 billion a year. Large reinsurance companies estimate the annual economic loss due to climate change could reach $150–300 billion per year within a decade. The value of intact ecosystems far outweighs the cost of protecting them.
Government subsidies need to switch from fossil fuels to renewable sources of energy (it is estimated that industrial countries subsidize fossil fuels with $200 billion a year). Other suggestions include: raising fuel efficiency standards 5% a year relative to GDP; an environmental footprint tax for using more than 1.8 global hectares per person; a 1% tax on the $1.5–2 trillion of international financial transactions per day; and mandating improved car mileage one mile per year. Taxes on international travel, carbon, and urban congestion should be considered. Such tax income could support an international public/private funding mechanism for high-impact technologies. Massive public educational efforts via film, television, music, games, and contests should stress what individuals and groups can do. The synergy between economic growth and technological innovation has been the most significant engine of change for the last 200 years, but unless we improve our economic, environmental, and social behavior and close the gap between the rich and the poor, the next 200 years could be difficult. Next to the proliferation of weapons of mass destruction, unsustainable growth may well be the greatest threat to the future of humanity. Yet without sustainable and equitable growth, billions of people will be condemned to poverty and much of civilization will collapse.
We should promote ISO environmental standards and guides like the Natural Step and Equator Principles, publicize “sustainability report cards” on company practices, declare key habitats off-limits for human development, establish a World Environment Organization with powers like the WTO, create an international environmental crimes intelligence and police unit, and encourage synergy between environmental movements and human rights groups to make clean air, water, and land a human right.
Challenge 1 will be addressed seriously when the average calories per person
per day exceed 2,000, the number of hungry people diminishes by half, the global
acreage in forests increases for five years, and GDP increases while greenhouse
gas emissions decrease for five years in a row.

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