Recent instances of irresponsible controlled burning have sparked concern among members of affected and concerned communities.
nice start 
In his letter to the editor, John Christiansen contends that planned burnings are a ploy for state governments to present a facade of action against bush fires that only increase the risk of such disasters occurring rather than an effective measure of control
really nicely written (I like the simple clear start of 'in his ___, author contends....'), but you've tried to cram a bit too much into your contention so the sentence is a bit roundabout - either cut out bits or split in two. Similarly, Upper Plenty resident Bonny Francis argues that the Environment Department’s back burning measures are “irresponsible” and only exacerbate the issue.
again, nice sentence - but does it fully embody the message of her piece? She's much more 'alarmist' and emotional - she doesn't just logically explain that it exacerbates the issue, she tries to get us stressed as about it!Really nicely written intro - short, to the point, clear, well-expressed, and covers what you need to cover. No dramas, you've got this down pat!Christiansen begins with his admission that he has never witnessed an instance where controlled burning has “stopped or slowed the progress” of a bushfire.
this quote feels like it's put here 'just coz' - you could've picked out more powerful quotes that you can specifically analyse (e.g. 'I am not aware of one instance' - super forceful, right? like, there's not even ONE CASE on EARTH that's been successful guys!! - it's not an 'admission' it's a forceful/frustrated statement). Quotes aren't there just to fill out your writing, instead they're supposed to provide one little 1-4 word piece of language that you can analyse and focus on how those particular words/language make us feel This creates an immediate feeling of scorn
good 
directed at the Environment Department and other responsible parties among his readership who are presumably victims or bush fires whilst presenting the argument that controlled burning is useless
which pervades his letter. Francis employs a similar approach in her letter, branding fuel-reduction burns as “useless”
impact? how does this word/argument make us feel?. Christiansen continues to highlight the perceived disadvantages of planned burning by alerting readers of the “poor air quality” it causes in regional areas that “seriously affects the health” of residents. Through this statement, Christiansen seeks to create a sense of alarm whilst asserting that the actions of the Environment Department are detrimental to their health and therefore cannot be of benefit to anyone. In suggesting that authorities need to “preven[t] arson” and focus on “education of machinery”, Christiansen presents a solution for bush fire prevention. He advocates for “21st century technology” to be employed to save lives, which appeals to readers’ own desires to stay up to date
good 
that should be reflected through fire authorities’ methodology. Christiansen concludes by stating that Australian services are not using the “large jet tankers” of the US. This acts to elicit concern in readers who will view Australian Environmental Services as out of date and therefore ineffective.
In contrast to Christiansen, Francis adopts an anecdotal and inclusive approach to persuade her target audience. She begins by stating that “we rebuilt to protect ourselves” and that “we are hyper-vigilant” about weather conditions. The words “protect ourselves” and “hyper-vigilant” connote negative feelings towards environmental authorities as they imply that they have failed to keep her community safe
how do those particular words imply this? and can you be specific about what negative feelings you're talking about? *** whilst evoking a sense of collective hardship resulting from “useless reduction burn”
(start new sentence at red asterisks - always give yourself a bit more space to analyse things; you have all the room in the world! It's tempting to try cramming too much into one sentence, but always breathe and feel free to spread over 2-3 sentences on one quote. This is further supported by her description of not an “arsonist… but an employee of the Environment Department” causing embers from a nearby bushfire to land in her town.
so why does she use this language? Is that quote particularly strong/emotive/persuasive? She speaks on behalf of her township to create a sense of fear in saying that “we are extremely nervous” that the Environment Department will re-create that “tragic [Black Saturday] in 2009”.
I feel that the letter is actually more emotional and stressed-out than this...
The biggest thing is perhaps picking out cooler quotes so you can analyse how the language and tone makes us feel - examples: Anyone with a grain of sense, trauma and loss, relive that
tragic day, how can it have been so irresponsible, devastated, this
ridiculous practice [/b]must[/b] cease, I am not aware of
one instance, etc. You don't wanna dump in random quotes for the sake of it - instead, think, what words are the most powerful and impacting, let's discuss THEM and how exactly that choice of words impacts me!
Also just more analysis and a bit less description of what the author is doing - for example:
She speaks on behalf of her township to create a sense of fear in saying that “we are extremely nervous” that the Environment Department will re-create that “tragic [Black Saturday] in 2009”.
Green = description of what she says or does
Red = analysis of impact
You want more RED all throughout! A good exercise could be going through your past essays/work yourself and highlighting any analysis - the more highlights you have in a paragraph the better! Keep working for more and more highlighted chunks in your essay

(e.g. rather than just quoting 'that tragic day in 2009', you could analyse the impact of the word 'tragic', etc. I want you to be picking out the most powerful things and analysing the hell out of them, which mainly means grab 1-2 words like 'tragic' or 'ridiculous' and think how it makes us feel.)
But anyways, this is a really good piece, don't feel any stress about it! Just keep working on more analysis, more analysis, more analysis. Pull out specific powerful quotes and think about how EXACTLY they make us feel!
And you will kill this 
This whole feedback is poorly explained (I also pressed backspace in my browser and lost it first time round

) because I'm just dead tired from work.