Iestyn Tyne is a poet and author working mainly in Welsh. He lives in North Wales and is co-editor of the independent creative publication Y Stamp. He has published two volumes of poetry, Addunedau [Resolutions] (2017) and ar adain [on the wing] (2018), and a pamphlet, Cywilydd [Shame] (2019). The three poems included in this anthology come from Cywilydd, a sequence of jazz sonnets in response to the climate emergency.