The second phase of the Green Revolution is termed from the mid-1970s to the mid-1980s. This period marks a significant developmental stage in agricultural practices and policies following the initial success of the Green Revolution, which began in the mid-1960s. The second phase focused on broadening the benefits of the Green Revolution to additional regions and further enhancing crop yields through the use of advanced technology, irrigation, and continued improvements in crop varieties.
During this period, efforts were made to address the limitations and challenges faced in the first phase, such as the environmental and socio-economic impacts, by introducing more sustainable agricultural practices and promoting equitable distribution of its benefits.
Thus, the correct answer is: Mid 1970s to mid 1980s.