How far would you peddle for the environment?
It took 68 days for Satyen Das to pedal his rickety bicycle rickshaw from the seaside Indian city of Kolkata to the roof of the world at a 17,600-foot Himalayan pass. His goal was to promote the vehicle as an environmentally sound travel option.
As he pedaled toward the top of Khardung La on the world's highest motorable pass, he remembered the words of his wife and 9-year-old daughter: "You must complete this mission."
The journey was arduous. He trained by loading his rickshaw a carriage-styled seat hooked to a bicycle with heavy items and cycling long distances. He added a third brake pedal. And when the time came to set off on his journey on June 11, he packed lightly. He took only a few items of clothing, medicine, food and a stove, a sleeping bag and plastic sheets for an emergency.
"I crossed five high mountain passes on the way," Das, 40, said in an interview. At one point, he faced a group of bears. But he was relieved when they showed little interest in him or his rickshaw.
Near his destination, he took shelter with Indian paramilitary forces after sighting an elusive snow leopard in the high reaches of the region of Lakadh. And on his way home, another cyclist in the mountains offered him food and shelter from the cold.
In total, he covered nearly 4,440 miles. That made him the first to accomplish the feat. He hopes to have it endorsed by Guinness World Records.
The idea "was to popularize the cycle-rickshaw as eco-friendly transport that does not need any fuel," he said.
It's a mode of transport he and his family have relied on their entire lives. Das earns about 200 rupees ($3.20) a day transporting passengers in Kolkata, the capital of India's West Bengal state. Under its former name Calcutta, it was a homebase for Imperial Britain when it ruled the South Asian subcontinent.
Das started as a so-called "rickshaw wallah" under his father, who also pedaled a rickshaw for a living.
He enjoyed the job, he said, because "there was no one to boss me around!"
But he always dreamed of setting an example for others. And he wondered how to do it being poor and with little education.
"So I thought, why not do something which is within my reach. I decided to spread the message of peace using my cycle-rickshaw," Das said.
He made his first attempt for Ladakh in 2008. He carted his wife and daughter up to an altitude of 13,050 feet on the Rohtang pass of Himachal Pradesh state before running out of cash.
For his latest expedition, he received 150,000 rupees (about $2,460) from a sponsor.
Critical thinking challenge: How is Satyen Das rickshaw an environmentally sound travel option?