>Tell me about this study(I mean what did you actually learnt and what they teaches under this title) Does this subject related to global warming? How can I study this subject(if I wish sometime)

We learn a lot from studying fire scars in tree rings. We are able to figure out the exact years and even season of past fires, going back through time. For example, in the Piedmont of North Carolina, we recently found that fires occurred every few years over previous centuries by studying the fire scars. If you’re interested in learning more, there are a lot of great general resources!

A great introductory text to tree-ring science is:

Speer, J. H. (2010). Fundamentals of tree-ring research. University of Arizona Press.

An excellent overview article that discusses using tree rings for fire history is available here (Falk et al., 2011 - Multi-scale controls of historical forest-fire regimes: new insights from fire-scar networks):

https://www.fs.usda.gov/research/treesearch/39310

Here’s another article on next steps for tree-ring based research on fire (Harley et al., 2018 - Advancing Dendrochronological Studies of Fire in the United States):

https://www.mdpi.com/2571-6255/1/1/11

A few nice online articles/resources include:

https://scied.ucar.edu/learning-zone/how-climate-works/tree-rings-and-climate

https://www.nytimes.com/2019/04/30/science/tree-rings-climate.html

https://ltrr.arizona.edu/about/treerings