A review of scientific research conducted since 2007, the Intergovernmental Panel on Climate Change (IPCC) report definitively concludes that the effects of climate change are already impacting everything from global safety to food supplies.
"There is no one on Earth who escapes the effects of climate change," Oppenheimer told CBS News. The most pressing matter, he said, is food supply.
A warmer world will push food prices higher, trigger "hotspots of hunger" among the world's poorest people, and put a crunch on supplies of Western delicacies like fine wine and robust coffee, according to the 32-volume report issued Monday.
Other major impacts outlined in the report include coastal and inland flooding causing damage to big cities, extreme heat waves, and other weather phenomena.
Even though heat and carbon dioxide are often considered good for plants, the overall effect of man-made warming is that it will reduce food production compared to a world without global warming, the report said.
Climate change already impacting food supply, UN study shows
"As we go forward in time, we're going to see first in the poorer countries... decreases in some of the main crops like wheat or corn that feed their populations. Eventually they get into trouble and they don't have enough food to feed their people," said Oppenheimer.
The food issue is especially daunting, he added, because the demand for food will only continue to grow as populations increase. Historically, technological advances have helped keep up with the growing demand.The "green revolution" of improved agricultural techniques has helped increase crop production by about 10 percent per decade. But climate change is likely to reduce yields by 1 percent a decade.
Those numbers aren't consistent around the world. Some places have seen crop yield increases drop from 2 percent a year to 1 percent or even plateau. And places like India, where 800 million people rely on rainfall rather than irrigation for their crops, the green revolution never improved crops much, said IPCC chairman Rajendra Pachauri.
Relying on technology to solve problems poses a risk in itself, added Oppenheimer. "We don't know when the new technological developments are going to happen. All we do know is that right now, demand and supply globally are pretty close," he said.
The last time the panel reported on the effects of warming in 2007, it said it was too early to tell whether climate change would increase or decrease food production, and many talked of a greening world. But in the past several years the scientific literature has been overwhelming in showing that climate change hurts food production, said Chris Field of the Carnegie Institution of Science and lead author of the climate report.
Food prices are likely to go up somewhere in a wide range of 3 percent to 84 percent by 2050 just because of climate change, the report said.
The report specifically mentions warming squeezing out crops in some of the richer coffee-growing areas in Central and South America, apple orchards in eastern Washington, and cherry orchards in California.
And where you get your wine may be changing. Both quantity and quality of wine can be hurt in much of Europe, the United States and Australia, while Portugal and British Columbia in Canada may become better places for wine, the report said.
Furthermore, it's not just crops on land that are being affected. A warmer and more acidic ocean is changing where fish live, making them harder to catch, and making it harder to feed people who rely on fish, Pachauri said.