In Panama, thousands of Guna islanders are on the risk of loosing their area due to the affects of global warming.
Jackson, who has been a leader of the US civil rights movement since the mid-1960s, said he planned to advocate to find a cure for the disease which afflicts 7 to 10 million people worldwide.
A massive search to locate the vessel which may have suffered a communication error has been initated, a navy spokesman says.
Treasury Secretary Steven Mnuchin says US "obviously monitoring the situation" in Saudi Arabia where high-profile detainees will reportedly swap assets and cash in return for their freedom.
The expansion has faced fierce opposition from environmental groups, American Indian tribes and some landowners.
Monarchs migrate each autumn from Canada and the US but climate swings delay their migration and illegal logging threatens their habitat.
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