In a press conference with Argentina's President Mauricio Macri, she said that both countries want to be a part of the "interconnected world" and are dedicated to protecting the Paris accord.
Speaking during a visit to Mexico City, Merkel said Germany was ready for the Brexit talks, which May said would begin on June 19 as scheduled - although she now risks more opposition to her European Union departure plans from inside and outside her party.
Pena Nieto's Mexican government has been actively seeking new trade opportunities since US President Donald Trump came to office with a threat to curb Mexico's privileged access to American markets.
Similar criticisms were leveled at Merkel over the austerity policies she supported in Europe during its financial crisis.
German Chancellor Angela Merkel has expressed willingness to join Brexit talks, scheduled to begin on 19th of this month.
Merkel praised Argentina's potential for the development of renewable resources and said Germany could use its experience to help develop them.
On this front, Germany has been cooperating with the Attorney General's Office (PGR) and victim associations, Merkel said as she started her less than a day's visit on Friday evening to the Latin American country, the second since 2008.
A Free trade agreement between the European Union and Mercosur, the South American regional organisation is under preparation, but agricultural issues still remain as one of the major obstacles, Kinga Brudzi?ska told EURACTIV Poland in an exclusive interview.
The European Parliament's Brexit co-ordinator, Guy Verhofstadt, said: "Yet another own goal, after Cameron now May, will make already complex negotiations even more complicated".
Jean-Claude Juncker, President of the European Commission, said he was also ready to start talks and hoped the United Kingdom general election would not have an impact.
"In this sense, I am very optimistic".
"We've agreed the date [for talks], and from what I've heard from the prime minister [May] they will stick to their negotiating plan".
During Merkel's visit she was expected to defend democracy and cooperation, and strengthen trade and investment ties with Mexico.