Final answer:
Liya is using the discussion technique of evaluating source diversity, highlighting the importance of varied perspectives in research, especially regarding global issues like climate change.
Step-by-step explanation:
Liya is employing the discussion technique of examining the source diversity of the articles in question. This technique implicates the breadth and variety of perspectives presented in the research. She's pointing out a potential geographical bias, which may lead to a narrower perspective on climate change. It is valuable in a discussion about such a global issue to seek out and consider diverse viewpoints to form a more holistic understanding.
In any research, particularly in topics as complex and wide-ranging as climate change, engaging with diverse sources is fundamental. It allows for a multi-faceted exploration of the subject, incorporating different cultural, political, and scientific viewpoints which can enrich the overall analysis and reduce the risk of a skewed narrative. Therefore, Liya's critical approach to the authors' geographic homogeneity suggests she understands the importance of -source credibility and -diversity for a well-rounded discussion.