Kyoto represents a small but critical step forward.
"This agreement is a critical step forward in building a sustainable future for all," he said.
UN secretary general Ban Ki-moon said the deal marked a "critical step forward", suggesting more work ahead.
"This is a critical step forward in tackling the MDR-TB public health crisis," said Dr Mario Raviglione, the director of the WHO's global TB programme.
The company said last month that it was implementing new procedures that it called "a critical step forward to address fire and building safety issues" in Bangladesh.
Frances Beinecke, president of US-based environmental group the Natural Resources Defence Council, said: "These landmark commitments to curtail carbon pollution are a necessary, critical step forward in the global fight against climate change.
But the New Orleans agreement is notable for the broad array of issues it addresses; Mr. Holder called the agreement a "critical step forward" that could "serve as a reference point — and a potential model for success — in our future efforts".
"This is a critical step forward for women's health that will prevent abortions and ensure that millions of American families have access to affordable birth control," said Senator Barbara Boxer of California in a statement.
The work marked a critical step forward from earlier methods, which had centred on motivational competitions and schools developed specifically around a STEM curriculum and yet had failed to expand and have an impact on large numbers of students.
