Bert Almon uses the literary device of imagery when he writes in this poem that:
the sun rose blue over Great Britain.
Imagery is description that uses the five senses of sight, sound, touch, taste, and smell. In this case, Almon illustrates the interconnectedness of events across the globe. It is forest fires in the west of Canada that cause the sun to look blue in Great Britain, a nation on the other side of the world. "Blue" is a visual image and a startling color to use to describe the sun—which we usually associate with colors such as yellow, orange, and red. Poetic images often challenge our perception in this way.
"Blue" also can act as a pun in this context. A pun is a word with a double meaning. Not only might the sun appear blue because of the haze produced half a world away by fires, the word "blue" can also mean to be sad or depressed; thus, the sun can also be personified (assigned human attributes) as sad because of the fires.
When Almon writes:
whose labour I lift on my fork
he uses the literary device of alliteration. Alliteration occurs when two words in close proximity begin with the same consonant. In this case, "labour" and "lift" begin with "l," creating a sense of rhythm as we read the line.