Transcript: Gavin Schmidt on PBS Newshour to reveal how he knows NASA GISS temperature data reported 1/16/15 was connected to human CO2--even though no CO2 studies came with the temp. data. When asked to share his evidence, Schmidt says, "it's a picture you get when you think about what's happening." He says corrective CO2 policies can be enacted in "full light of scientific evidence we have found"

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1/16/15, "Only a little bit hotter, but 2014’s record temperatures continue long-term trend," PBS Newshour, pbs.org. Transcript

"2014 was the hottest year in recorded history, even despite below-average temperatures in the Eastern U.S. Judy Woodruff speaks with Gavin Schmidt of NASA’s Goddard Institute for Space Studies about the human impact on global warming."

"JUDY WOODRUFF: Scientists report that 2014 was the hottest year in recorded history for the planet, and that dates back to 1880. This was announced today by both NASA and NOAA, the Oceanic and Atmospheric Agency.

Five months last year set temperature records. The ocean surface was unusually warm around the world, except for Antarctica. In the U.S., the Western part of the country baked under extreme heat, shown here in yellow, although the Eastern half of the country saw below-average temperatures, as seen in blue. And there were temperature records set in several European countries.

Well, we get further insight and information on all of this from one of the lead scientists involved with the report.

Gavin Schmidt studies climate change at NASA’s Goddard Institute for Space Studies. And, Gavin Schmidt, we welcome you to the program.

GAVIN SCHMIDT, NASA Goddard Institute for Space Studies: Thank you very much for having me.

JUDY WOODRUFF: So spell this out a little bit more for us. How did 2014 differ from other years?

GAVIN SCHMIDT: Well, 2014 was only a little bit different from previous years, but what we’re seeing is a long-term trend that is producing record warm year after record warm year. The previous record was in 2010, before that 2005, before that 1998. So this year is part of a long-term trend that is just going to continue.

JUDY WOODRUFF: But, when you say it’s only a little different, I mean, by a fraction of a fraction, is that right?

GAVIN SCHMIDT: Right. So, there is — there — each year makes a record. It’s like people running a marathon. They only beat the record by a few seconds each time, but times are getting faster. The globe is warming up.

JUDY WOODRUFF: And am I right? I believe I read today that the 10 hottest years on record have all occurred since 1997?

GAVIN SCHMIDT: Yes, that’s right. Nine of those have occurred in the last 10 years. 1998 was a real standout year, and so that’s still in the top five. But we have warmed about 1.5 degrees Fahrenheit since the beginning of the 20th century — beginning of the 20th century. And we attribute those changes mainly to the increase in greenhouse gases, particularly carbon dioxide, that we have been putting into the atmosphere.

JUDY WOODRUFF: And just to be clear, we showed a map of the United States, the Western part of the country very hot, but the Eastern part of the United States cooler. But you still had, overall, this record.

GAVIN SCHMIDT: That’s right. In any one year, there is a lot of variability. Sometimes, you have an El Nino event in the Tropical Pacific. That could make a difference. You always have weather and various natural variability that is going on, and so you never see a uniform pattern. You are always going to see some place that were warmer, some places that were cooler. But in our analysis, we’re trying to average over all of those things to get a sense of what the whole globe is seeing on a long-term scale.

JUDY WOODRUFF: So what do you and other scientists believe is going on here?

GAVIN SCHMIDT: Well, so, year to year, there’s a lot of noise, a lot of chaos and dynamism in the climate system. But the underlying trend, the trends that we have seen since the 1970s particularly, that’s being driven, that’s being pushed. And it’s being pushed mainly by carbon dioxide increases in the atmosphere, which are adding to the greenhouse effect, which is making the planet warmer.

JUDY WOODRUFF: Carbon dioxide, meaning manmade emissions?

GAVIN SCHMIDT: Yes, carbon dioxide mainly comes from the burning of fossil fuels, coal, oil, natural gas, and from deforestation, mainly in the tropics.

JUDY WOODRUFF: So, to the skeptics who are out there vocally when a report like this comes out, saying, wait a minute, 

there's no proof that there is connection to what humans do

you say what?

GAVIN SCHMIDT: So, you know, science works by putting all the bits of evidence together. We have looked for all sorts of different fingerprints of change. We have looked to see whether the warming is caused by oscillations in the ocean, whether it’s caused by changes in the sun or volcanoes or all sorts of different things. But what we find is that the picture that you get when you think about what’s happening with greenhouse gases fits the data, not just at the surface, but in the — higher up in the atmosphere, in the ocean, in the Arctic, all around. And so we have a fingerprint of change that is associated with human activities, and that fingerprint fits the evidence that we’re seeing in the data.

JUDY WOODRUFF: Separately, Gavin Schmidt, we saw yesterday in the journal “Science” this report that humans, it basically concludes, are causing unprecedented damage to the oceans and to life, to animals’ life in the oceans. When you put that together with the temperature findings, what does that tell you?

GAVIN SCHMIDT: Well, human impact on the planet, with the population that we have and the huge exponential growth in population, we’re having exponentially growing effects on the planet across a whole suite of different metrics, whether it’s ocean acidification, whether it’s overfishing, whether it’s habitat loss, whether it’s deforestation. All of the graphs look very similar. It’s flat for a long time and then it shoots up. We’re in that exponential growth phase. And we have to be very, very careful that we don’t exceed our reach and damage systems that can’t be recovered.

JUDY WOODRUFF: Any glimmer of hopefulness in all this?

GAVIN SCHMIDT: Well, I think the glimmer of hopefulness is that we’re having a conversation about that. We’re discussing these things, hopefully in a sustainable manner. We’re talking about ways to mitigate and to adapt to the changes that were coming about.
And these kind of conversations that we’re having now help raise awareness and help us make sure that the people who are making decisions are making decisions in the full light of the scientific evidence that we have found.

JUDY WOODRUFF: Gavin Schmidt, who is the director of the Goddard Institute for Space Studies at NASA, we thank you.

GAVIN SCHMIDT: Thank you."

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