Ramesh said Gandhi followed her 'Mann Ki Baat' and implemented it seriously.
Speaking at the 'Times Literary Festival' here, on the topic of 'Indira Gandhi and Environment', he said the late Prime Minister was a very accessible leader.
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"She didn't tell the other person that she had all the answers to all the world's problem entire environmental odyssey was a 'mann ki baat', but a listening 'mann ki baat'," he said, without naming Modi.
'Mann ki Baat' is hosted by Prime Minister Narendra Modi every month in which he addresses the people of the nation on various issues.
"She would take action on letters received from people, which shows that she was personally and instinctively committed to the cause of the environment," he said.
This was before the age of Twitter, Facebook, Instagram, and emails, Ramesh said.
Talking about Gandhi's inclination towards the environment, Ramesh said she was India's "first and last prime minister to have this great passion for nature conservation and environmental protection.