Instituto Juan de Mariana (IJM)
The Instituto Juan de Mariana (IJM) is a private nonprofit group founded in 2005 that describes itself as an “independent institution devoted to research of public affairs” and claims not to receive funding from any government or political party. The Institute's mission is “to investigate and make known to the public Spanish, European and Latin American, the benefits provided to the general interests of private property, free enterprise and limited scope of public authorities.” , 
The president and founder of Instituto Juan de Mariana is Gabriel Calzada, a climate change skeptic with connections to other conservative think tanks including the Ludwig von Mises Institute, Centre for the New Europe, and the Libertarian Alliance.
Stance on Climate Change
According to Gabriel Calzada, fonder and president of IJM, there is no direct relation between CO2 emissions and “supposed global warming”. He believes Humans have no capacity to cause climate change. 
According to their website, the Institute “relies on donations from like-minded private individuals, foundations and institutions to fund its activities.” Instituto Juan de Mariana has affirmed that it “finances all its activities through the individual donation of his over 250 individual members” and that they do not accept corporate funding with the exception of one small Spanish insurance company. , 
- Gabriel Calzada — President, Founder.
- Juan Ramón Rallo — Director.
- Daniel Rodriguez Herrera — Vice President and Director of Information and Communication Technologies. Also editor of Libertad Digital. 
The Instituto Juan de Maria was a co-sponsor (PDF) of the Heartland Institute's Fourth International Conference on Climate Change in Chicago. DeSmogBlog found that 19 of the conference's 65 sponsors had received over $40 million from ExxonMobil since 1985. 
Shortly after President Obama cited Spain's success at creating green jobs, Republicans brought in Gabriel Calzada, president of Institute Juan de Mariana to present a study (PDF available here) that claimed each green job in Spain destroyed 2.2 jobs as a result. The study bore the letterhead of the University of Rey Juan Carlos where Calzada is Associate Professor, but was co-commissioned by the Instituto Juan de Mariana.
According to the study, “the Spanish/EU-style 'green jobs' agenda now being promoted in the U.S. in fact destroys jobs. […] The study’s results demonstrate how such 'green jobs' policy clearly hinders Spain’s way out of the current economic crisis, even while U.S. politicians insist that rushing into such a scheme will ease their own emergence from the turmoil.”
Calzada testified before the House Select Committee on Energy Independence, stating that “Europe's experience actually suggests that this is precisely the wrong approach.” The study that Calzada referenced was debunked by the Spanish Government. Gabriel Calzada also appeared on Fox News to promote his study. , , 
When the IJM was launched in 2005, it began with a seminar against the Kyoto Protocol that was attended by climate change skeptic Christopher Horner from the Competitive Enterprise Institute. Gabriel Calzada, the founder of IJM previously represented the Center for the New Europe in Spain.
The seminar which examined Kyoto and the Spanish Economy attracted Alberto Recarte, president of Liberty Digital, who said that Spain would be the country to “Pay Kyoto in absolute terms.” IJM arranged the conference in collaboration with the Competitive Enterprise Institute and the University of Rey Juyan Carlos. Juan Jose Toribio, President of IESE in Madrid and former IMF Executive Director was also a speaker. 
- Atlas Economic Research Foundation
- Liberty Digital (Libertad Digital)
- The Heartland Institute
- Competitive Enterprise Institute
- Ludwig von Mises Institute
- Centre for the New Europe
- Libertarian Alliance
“The Institute” (Translated from Spanish via Google), Institute Juan de Mariana. Accessed March 2, 2013.
“Mission and objectives“ (Translated from Spanish via Google), Institute Juan de Mariana. Accessed March 2, 2013.
“Concealing their sources - who funds Europe’s climate change deniers?” (PDF), Corporate Europe Observatory, December 2010.
“Support JMI”, Institute Juan de Mariana. Accessed March 2, 2013.
Josh Harkinson. “Climate Change Deniers Without Borders,” Mother Jones, December 22, 2009.
“Daniel Rodríguez Herrera,” Instituo Juan de Mariana. Translated with Google. Accessed March 2, 2013.
“4th International Conference on Climate Change” (PDF), retrieved from uhaweb.harford.edu, March 2, 2013.
PERE RUSIÑOL. “The neoliberal lobby PP Spain in the U.S. boycotts” (Translated from Spanish via Google), Publico.es, July 18, 2009.
“Calzada on Fox News Green Jobs Special,” YouTube Video uploaded by user 'energyforamerica,” September 27, 2011.
“Kyoto and the Spanish economy,” LibertadDigital. Archived April 21, 2005.
“Instituto Juan de Mariana,” Wikipedia.